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Income Tax (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Income Tax Contingency [Line Items] | |||||||||||
| State operating loss carryforwards, set to begin to expire in 2023 | $ 25,300,000 | $ 25,300,000 | |||||||||
| State tax credit carryforwards, set to expire in 2014 | 1,700,000 | 1,700,000 | |||||||||
| Current tax (benefit) expense | 21,581,000 | 21,218,000 | 21,688,000 | ||||||||
| Deferred tax expense (benefit) | 5,413,000 | (3,656,000) | (3,783,000) | ||||||||
| Income tax expense (benefit) | 7,911,000 | 6,734,000 | 7,414,000 | 4,935,000 | 5,342,000 | 4,655,000 | 4,367,000 | 3,198,000 | 26,994,000 | 17,562,000 | 17,905,000 |
| Deferred tax assets: | |||||||||||
| Allowance for loan and lease losses | 27,196,000 | 30,027,000 | 27,196,000 | 30,027,000 | |||||||
| Supplemental executive retirement plan | 8,565,000 | 6,967,000 | 8,565,000 | 6,967,000 | |||||||
| Stock option and restricted stock | 917,000 | 682,000 | 917,000 | 682,000 | |||||||
| OREO costs | 7,929,000 | 3,801,000 | 7,929,000 | 3,801,000 | |||||||
| Nonaccrual interest | 2,354,000 | 193,000 | 2,354,000 | 193,000 | |||||||
| Deferred tax assets, purchase accounting | 15,551,000 | 0 | 15,551,000 | 0 | |||||||
| Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross | 7,176,000 | 0 | 7,176,000 | 0 | |||||||
| deferred tax liabilities, unrealized gains on available-for-sale securities | 0 | 11,150,000 | 0 | 11,150,000 | |||||||
| Other | 1,741,000 | 557,000 | 1,741,000 | 557,000 | |||||||
| Total deferred tax assets | 71,429,000 | 42,227,000 | 71,429,000 | 42,227,000 | |||||||
| Deferred tax liabilities: | |||||||||||
| Asset purchase tax basis difference | (7,754,000) | (19,408,000) | (7,754,000) | (19,408,000) | |||||||
| FHLB stock dividends | (4,159,000) | (1,963,000) | (4,159,000) | (1,963,000) | |||||||
| Purchase accounting | 0 | (745,000) | 0 | (745,000) | |||||||
| Deferred loan fees | (4,512,000) | (1,755,000) | (4,512,000) | (1,755,000) | |||||||
| Depreciation | (7,076,000) | (1,870,000) | (7,076,000) | (1,870,000) | |||||||
| Total deferred tax liabilities | 23,501,000 | 36,891,000 | 23,501,000 | 36,891,000 | |||||||
| Net deferred tax (liability) asset | 47,928,000 | 5,336,000 | 47,928,000 | 5,336,000 | |||||||
| Reconciliation of effective income tax rate with federal statutory tax rate | |||||||||||
| Income tax based on statutory rate | 30,454,000 | 22,297,000 | 23,080,000 | ||||||||
| Income tax based on statutory rate, percent | 35.00% | 35.00% | 35.00% | ||||||||
| Tax credits | (1,038,000) | (504,000) | (608,000) | ||||||||
| Tax credits, percent | (1.00%) | (1.00%) | (1.00%) | ||||||||
| Tax exempt instrument | (4,113,000) | (3,906,000) | (3,824,000) | ||||||||
| Tax exempt instrument, percent | (5.00%) | (6.00%) | (6.00%) | ||||||||
| Life insurance proceeds | (1,250,000) | (1,001,000) | (766,000) | ||||||||
| Life insurance proceeds, percent | (1.00%) | (2.00%) | (1.00%) | ||||||||
| Bargain purchase | 0 | 0 | (1,036,000) | ||||||||
| Bargain purchase, percent | 0.00% | 0.00% | (2.00%) | ||||||||
| effective income tax rate reconciliation, nondeductible expense, business combination, amount | 1,362,000 | 0 | 0 | ||||||||
| effective income tax rate reconciliation, nondeductible expense, business combination, percent | 2.00% | 0.00% | 0.00% | ||||||||
| Other, net | 1,579,000 | 676,000 | 1,059,000 | ||||||||
| Other, net, percent | 1.00% | 1.00% | 2.00% | ||||||||
| Income tax expense (benefit) | 7,911,000 | 6,734,000 | 7,414,000 | 4,935,000 | 5,342,000 | 4,655,000 | 4,367,000 | 3,198,000 | 26,994,000 | 17,562,000 | 17,905,000 |
| Income tax provision (benefit), percent | 31.00% | 27.00% | 27.00% | ||||||||
| Unrecognized tax position | 0 | 0 | |||||||||
| Interest and penalties on unrecognized tax benefits | $ 0 | ||||||||||