| **Quarterly Results of Operations (Unaudited) (Details) (USD $)In Thousands, except Share data, unless otherwise specified** | 3 Months Ended                                                                                                            | 12 Months Ended                                                                                                           |
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| **Quarterly Financial Information Disclosure [Abstract]**                                                                    |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   |   |   |   |
| Interest income                                                                                                              | $ 53,053us-gaap_InterestAndDividendIncomeOperating                                                                        | $ 53,290us-gaap_InterestAndDividendIncomeOperating                                                                        | $ 51,527us-gaap_InterestAndDividendIncomeOperating | $ 51,009us-gaap_InterestAndDividendIncomeOperating | $ 45,707us-gaap_InterestAndDividendIncomeOperating | $ 40,736us-gaap_InterestAndDividendIncomeOperating | $ 40,653us-gaap_InterestAndDividendIncomeOperating | $ 43,738us-gaap_InterestAndDividendIncomeOperating | $ 208,879us-gaap_InterestAndDividendIncomeOperating | $ 170,834us-gaap_InterestAndDividendIncomeOperating | $ 175,949us-gaap_InterestAndDividendIncomeOperating |
| Interest expense                                                                                                             | 5,893us-gaap_InterestExpense                                                                                              | 5,424us-gaap_InterestExpense                                                                                              | 5,408us-gaap_InterestExpense | 5,117us-gaap_InterestExpense | 4,572us-gaap_InterestExpense | 3,714us-gaap_InterestExpense | 4,003us-gaap_InterestExpense | 4,280us-gaap_InterestExpense | 21,842us-gaap_InterestExpense | 16,569us-gaap_InterestExpense | 23,613us-gaap_InterestExpense |
| Net interest income                                                                                                          | 47,160us-gaap_InterestIncomeExpenseNet                                                                                    | 47,866us-gaap_InterestIncomeExpenseNet                                                                                    | 46,119us-gaap_InterestIncomeExpenseNet | 45,892us-gaap_InterestIncomeExpenseNet | 41,135us-gaap_InterestIncomeExpenseNet | 37,022us-gaap_InterestIncomeExpenseNet | 36,650us-gaap_InterestIncomeExpenseNet | 39,458us-gaap_InterestIncomeExpenseNet | 187,037us-gaap_InterestIncomeExpenseNet | 154,265us-gaap_InterestIncomeExpenseNet | 152,336us-gaap_InterestIncomeExpenseNet |
| Provision for loan losses                                                                                                    | 960us-gaap_ProvisionForLoanLeaseAndOtherLosses                                                                            | 1,600us-gaap_ProvisionForLoanLeaseAndOtherLosses                                                                          |    |    | 1,016us-gaap_ProvisionForLoanLeaseAndOtherLosses | 1,533us-gaap_ProvisionForLoanLeaseAndOtherLosses | 1,997us-gaap_ProvisionForLoanLeaseAndOtherLosses | 2,102us-gaap_ProvisionForLoanLeaseAndOtherLosses | 2,560us-gaap_ProvisionForLoanLeaseAndOtherLosses | 6,648us-gaap_ProvisionForLoanLeaseAndOtherLosses | 18,534us-gaap_ProvisionForLoanLeaseAndOtherLosses |
| Net interest income after provision for loan losses                                                                          | 46,200us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss                                                              | 46,266us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss                                                              | 46,119us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 45,892us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 40,119us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 35,489us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 34,653us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 37,356us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 184,477us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 147,617us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 133,802us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss |
| Non-interest income                                                                                                          | 16,254us-gaap_NoninterestIncome                                                                                           | 18,294us-gaap_NoninterestIncome                                                                                           | 15,933us-gaap_NoninterestIncome | 15,186us-gaap_NoninterestIncome | 15,073us-gaap_NoninterestIncome | 11,800us-gaap_NoninterestIncome | 14,059us-gaap_NoninterestIncome | 13,877us-gaap_NoninterestIncome | 65,667us-gaap_NoninterestIncome | 54,809us-gaap_NoninterestIncome | 64,302us-gaap_NoninterestIncome |
| Non-interest expense                                                                                                         | 41,677us-gaap_NoninterestExpense                                                                                          | 42,576us-gaap_NoninterestExpense                                                                                          | 41,250us-gaap_NoninterestExpense | 43,089us-gaap_NoninterestExpense | 40,558us-gaap_NoninterestExpense | 34,219us-gaap_NoninterestExpense | 33,742us-gaap_NoninterestExpense | 34,700us-gaap_NoninterestExpense | 168,592us-gaap_NoninterestExpense | 143,219us-gaap_NoninterestExpense | 137,115us-gaap_NoninterestExpense |
| Income before income tax expense                                                                                             | 20,777us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 21,984us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 20,802us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 17,989us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 14,634us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,070us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 14,970us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 16,533us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 81,552us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 59,207us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 60,989us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
| Income tax expense                                                                                                           | 5,517us-gaap_IncomeTaxExpenseBenefit                                                                                      | 5,862us-gaap_IncomeTaxExpenseBenefit                                                                                      | 5,642us-gaap_IncomeTaxExpenseBenefit | 4,369us-gaap_IncomeTaxExpenseBenefit | 3,187us-gaap_IncomeTaxExpenseBenefit | 2,667us-gaap_IncomeTaxExpenseBenefit | 4,155us-gaap_IncomeTaxExpenseBenefit | 4,668us-gaap_IncomeTaxExpenseBenefit | 21,390us-gaap_IncomeTaxExpenseBenefit | 14,677us-gaap_IncomeTaxExpenseBenefit | 15,867us-gaap_IncomeTaxExpenseBenefit |
| Net income                                                                                                                   | 15,260us-gaap_NetIncomeLoss                                                                                               | 16,122us-gaap_NetIncomeLoss                                                                                               | 15,160us-gaap_NetIncomeLoss | 13,620us-gaap_NetIncomeLoss | 11,447us-gaap_NetIncomeLoss | 10,403us-gaap_NetIncomeLoss | 10,815us-gaap_NetIncomeLoss | 11,865us-gaap_NetIncomeLoss | 60,162us-gaap_NetIncomeLoss | 44,530us-gaap_NetIncomeLoss | 45,122us-gaap_NetIncomeLoss |
| Preferred stock dividends                                                                                                    |                                                                                                                 |                                                                                                                 |    |    | (241)us-gaap_PreferredStockDividendsAndOtherAdjustments | (430)us-gaap_PreferredStockDividendsAndOtherAdjustments | (852)us-gaap_PreferredStockDividendsAndOtherAdjustments | (857)us-gaap_PreferredStockDividendsAndOtherAdjustments |    | (2,380)us-gaap_PreferredStockDividendsAndOtherAdjustments | (4,539)us-gaap_PreferredStockDividendsAndOtherAdjustments |
| Net income available to common stockholders                                                                                  | $ 15,260us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic                                                           | $ 16,122us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic                                                           | $ 15,160us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 13,620us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 11,206us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 9,973us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 9,963us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 11,008us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 60,162us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 42,150us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 40,583us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
| Basic EPS                                                                                                                    | $ 0.41us-gaap_EarningsPerShareBasic                                                                                       | $ 0.45us-gaap_EarningsPerShareBasic                                                                                       | $ 0.42us-gaap_EarningsPerShareBasic | $ 0.38us-gaap_EarningsPerShareBasic | $ 0.34us-gaap_EarningsPerShareBasic | $ 0.35us-gaap_EarningsPerShareBasic | $ 0.35us-gaap_EarningsPerShareBasic | $ 0.38us-gaap_EarningsPerShareBasic | $ 1.66us-gaap_EarningsPerShareBasic | $ 1.42us-gaap_EarningsPerShareBasic | $ 1.42us-gaap_EarningsPerShareBasic |
| Diluted EPS                                                                                                                  | $ 0.41us-gaap_EarningsPerShareDiluted                                                                                     | $ 0.45us-gaap_EarningsPerShareDiluted                                                                                     | $ 0.41us-gaap_EarningsPerShareDiluted | $ 0.38us-gaap_EarningsPerShareDiluted | $ 0.34us-gaap_EarningsPerShareDiluted | $ 0.35us-gaap_EarningsPerShareDiluted | $ 0.34us-gaap_EarningsPerShareDiluted | $ 0.38us-gaap_EarningsPerShareDiluted | $ 1.65us-gaap_EarningsPerShareDiluted | $ 1.41us-gaap_EarningsPerShareDiluted | $ 1.41us-gaap_EarningsPerShareDiluted |
| **Average Shares Outstanding:**                                                                                              |                                                                                                                      |                                                                                                                      |   |   |   |   |   |   |   |   |   |
| Basic                                                                                                                        | 37,018,014us-gaap_WeightedAverageNumberOfSharesOutstandingBasic                                                           | 36,054,867us-gaap_WeightedAverageNumberOfSharesOutstandingBasic                                                           | 36,026,763us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 35,956,436us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,597,145us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,806,809us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,783,407us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,716,987us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 36,266,356us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 29,731,420us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,632,915us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
| Diluted                                                                                                                      | 37,323,276us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding                                                         | 36,328,981us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding                                                         | 36,294,149us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 36,260,624us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 32,912,605us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,081,472us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,023,513us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 28,971,238us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 36,554,609us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 30,008,380us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 28,846,684us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |

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| - Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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| - Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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| - Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.
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Amount of the cost of borrowed funds accounted for as interest expense.
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Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.
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The net amount of operating interest income (expense).
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).
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| - Definition
Total aggregate amount of all noninterest expense.
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| - Definition
The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.
+ References
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| - Definition
The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders.
+ References
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| - Definition
Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.
+ References
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| - Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
+ References
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