| Fair Value, by Balance Sheet Grouping [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | Quoted Prices in Active Markets | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Cash and cash equivalents | | $ | 83,614 | | | $ | 83,614 | | | $ | 83,614 | | | $ | - | | | $ | - | | Investment securities available-for-sale | | | 402,501 | | | | 402,501 | | | | | | | | 401,181 | | | | 1,320 | | Investment securities held-to-maturity | | | 91,752 | | | | 92,828 | | | | - | | | | 92,828 | | | | - | | Nonmarketable equity securities | | | 17,501 | | | | 17,501 | | | | - | | | | 17,501 | | | | - | | | | | | 7,996 | | | | 7,996 | | | | - | | | | 7,996 | | | | - | | | | | | 2,400,061 | | | | 2,321,390 | | | | - | | | | 27,941 | | | | 2,293,449 | | Accrued interest receivable | | | 6,799 | | | | 6,799 | | | | - | | | | 6,799 | | | | - | | | | | | 2,290 | | | | 2,290 | | | | - | | | | 2,290 | | | | - | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Deposits with no stated maturity | | | 1,772,680 | | | | 1,772,680 | | | | - | | | | 1,772,680 | | | | - | | Deposits with stated maturities | | | 741,072 | | | | 744,062 | | | | - | | | | 744,062 | | | | - | | | | | | 285,000 | | | | 285,000 | | | | - | | | | 285,000 | | | | - | | | | | | 29,736 | | | | 29,736 | | | | - | | | | 29,736 | | | | - | | Subordinated loan and junior subordinated debt | | | 33,501 | | | | 33,501 | | | | - | | | | 33,501 | | | | - | | | | | | 541 | | | | 541 | | | | - | | | | 541 | | | | - | | | | | | 3,149 | | | | 3,149 | | | | - | | | | 3,149 | | | | - | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Cash and cash equivalents | | $ | 70,526 | | | $ | 70,526 | | | $ | 70,526 | | | $ | - | | | $ | - | | Investment securities available-for-sale | | | 384,934 | | | | 384,934 | | | | | | | | 383,434 | | | | 1,500 | | Investment securities held-to-maturity | | | 106,458 | | | | 107,629 | | | | - | | | | 107,629 | | | | - | | Nonmarketable equity securities | | | 11,366 | | | | 11,366 | | | | - | | | | 11,366 | | | | - | | | | | | 4,943 | | | | 4,943 | | | | - | | | | 4,943 | | | | - | | | | | | 1,732,751 | | | | 1,674,081 | | | | - | | | | 32,117 | | | | 1,641,964 | | FDIC indemnification asset | | | 943 | | | | 925 | | | | - | | | | - | | | | 925 | | Accrued interest receivable | | | 5,082 | | | | 5,082 | | | | - | | | | 5,082 | | | | - | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Deposits with no stated maturity | | | 1,412,882 | | | | 1,412,882 | | | | - | | | | 1,412,882 | | | | - | | Deposits with stated maturities | | | 539,780 | | | | 541,823 | | | | - | | | | 541,823 | | | | - | | | | | | 185,000 | | | | 185,000 | | | | - | | | | 185,000 | | | | - | | | | | | 30,000 | | | | 30,000 | | | | - | | | | 30,000 | | | | - | | Subordinated loan and junior subordinated debt | | | 24,262 | | | | 24,262 | | | | - | | | | 24,262 | | | | - | | | | | | 515 | | | | 515 | | | | - | | | | 515 | | | | - | | | | | | 7,325 | | | | 7,325 | | | | - | | | | 7,325 | | | | - | |
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| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
| | | Quoted Prices in Active Markets for | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | - | | | $ | - | | | $ | - | | | $ | - | | | | | | - | | | | 13,319 | | | | - | | | | 13,319 | | Residential agency pass-through securities | | | - | | | | 192,765 | | | | - | | | | 192,765 | | Residential collateralized mortgage obligations | | | - | | | | 94,410 | | | | - | | | | 94,410 | | Commercial mortgage-backed obligations | | | - | | | | 15,497 | | | | - | | | | 15,497 | | | | | | - | | | | 83,951 | | | | - | | | | 83,951 | | Corporate and other securities | | | - | | | | - | | | | 1,320 | | | | 1,320 | | All other equity securities | | | 1,239 | | | | - | | | | - | | | | 1,239 | | | | | | - | | | | 27,941 | | | | - | | | | 27,941 | | | | | | - | | | | 2,290 | | | | - | | | | 2,290 | | | | | | - | | | | 3,149 | | | | - | | | | 3,149 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | - | | | $ | 514 | | | $ | - | | | $ | 514 | | | | | | - | | | | 14,796 | | | | - | | | | 14,796 | | Residential agency pass-through securities | | | - | | | | 131,460 | | | | - | | | | 131,460 | | Residential collateralized mortgage obligations | | | - | | | | 151,631 | | | | - | | | | 151,631 | | Commercial mortgage-backed obligations | | | - | | | | 4,756 | | | | - | | | | 4,756 | | | | | | - | | | | 79,120 | | | | - | | | | 79,120 | | Corporate and other securities | | | - | | | | - | | | | 1,500 | | | | 1,500 | | All other equity securities | | | 1,157 | | | | - | | | | - | | | | 1,157 | | | | | | - | | | | 32,117 | | | | - | | | | 32,117 | | | | | | - | | | | 3,193 | | | | - | | | | 3,193 | | | | | | - | | | | 7,325 | | | | - | | | | 7,325 | |
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| Fair Value Measurements, Nonrecurring [Table Text Block] |
Fair Value on a Nonrecurring Basis | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | - | | | $ | - | | | $ | 3,332 | | | $ | 3,332 | | | | | | | | | | | | | | | | | | | | Commercial and industrial | | | - | | | | - | | | | - | | | | - | | | | | | - | | | | - | | | | 1,078 | | | | 1,078 | | CRE - investor income producing | | | - | | | | - | | | | 353 | | | | 353 | | AC&D - lots, land, & development | | | - | | | | - | | | | 748 | | | | 748 | | | | | | - | | | | - | | | | 211 | | | | 211 | | | | | | - | | | | - | | | | 2,077 | | | | 2,077 | | | | | | - | | | | - | | | | 2,438 | | | | 2,438 | | | | | | - | | | | - | | | | 243 | | | | 243 | | Other loans to individuals | | | - | | | | - | | | | - | | | | - | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | - | | | $ | - | | | $ | 5,451 | | | $ | 5,451 | | | | | | | | | | | | | | | | | | | | Commercial and industrial | | | - | | | | - | | | | - | | | | - | | | | | | - | | | | - | | | | - | | | | - | | CRE - investor income producing | | | - | | | | - | | | | 365 | | | | 365 | | AC&D - lots, land, & development | | | - | | | | - | | | | - | | | | - | | | | | | - | | | | - | | | | - | | | | - | | | | | | - | | | | - | | | | 725 | | | | 725 | | | | | | - | | | | - | | | | - | | | | - | | | | | | - | | | | - | | | | 251 | | | | 251 | | Other loans to individuals | | | - | | | | - | | | | - | | | | - | |
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