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Investment Securities, Part II (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) securities | Dec. 31, 2018 USD ($) securities | Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Proceeds from Sale of Available-for-sale Securities | $ 60,900,000 | $ 13,152,000 | $ 159,663,000
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 131,172,000 |  |
After 1 through 5 years | 377,027,000 |  |
After 5 through 10 years | 176,417,000 |  |
After ten years | 1,432,000 |  |
Fair Value | $ 686,048,000 | 692,274,000 |
Available-for-sale, Weighted Average Yield, Maturities Year One (in hundredths) | 2.70% |  |
Available-for-sale , Weighted Average Yield, Maturities After 1 through 5 Years (in hundredths) | 2.88% |  |
Available-for-sale, Weighted Average Yield, Maturities After 5 through 10 Years (in hundredths) | 2.81% |  |
Available-for-sale , Weighted Average Yield, Maturities After 10 Years (in hundredths) | 3.07% |  |
Available-for-sale , Weighted Average Yield, Maturities (in hundredths) | 2.83% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities Year One (in hundredths) | 2.94% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After 1 through 5 Years (in hundredths) | 3.08% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After 5 through 10 years (in hundredths) | 3.32% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After Ten Years (in hundredths) | 4.08% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities (in hundredths) | 3.12% |  |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | $ 64,511,000 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 5,031,000 |  |
Held-to-maturity, at amortized cost (estimated fair value of $69,572 and $67,909 at December 31, 2019 and 2018, respectively) | $ 69,542,000 | $ 69,436,000 |
Held To Maturity Weighted Average Yield Maturities Year One | 1.89% |  |
Held To Maturity Weighted Average Yield Maturities After 1 Through 5 Years | 2.06% |  |
Held To Maturity Weighted Average Yield Maturities After 5 Through 10 Years | 0.00% |  |
Held To Maturity Weighted Average Yield Maturities After 10 Years | 0.00% |  |
Held To Maturity Weighted Average Yield Maturities | 1.90% |  |
Held To Maturity Tax Equivalent Yield Maturities Year One | 1.89% |  |
Held To Maturity Tax Equivalent Yield Maturities After 1 Through 5 Years | 2.06% |  |
Held To Maturity Tax Equivalent Yield Maturities After 5 Through 10 Years | 0.00% |  |
Held To Maturity Tax Equivalent Yield Maturities After 10 Years | 0.00% |  |
Held To Maturity Tax Equivalent Yield Maturities | 1.90% |  |
Tax rate used to calculate tax-equivalent yields (in hundredths) | 21.00% | 35.00% |
Percentage investment book value exceeds total stockholders' equity (in hundredths) | 10.00% |  |
Available-for-sale Securities, Restricted | $ 688,000,000 | $ 628,000,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 93,924,000 | 136,312,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (398,000) | (1,748,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 21,235,000 | 319,611,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (191,000) | (9,513,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 115,159,000 | 455,923,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (589,000) | (11,261,000) |
Credit losses on trust preferred securities held [Abstract] |  |  |
Beginning of period | 0 | 1,111,000 | 1,111,000
Additions related to OTTI losses not previously recognized | 0 | 0 | 0
Reductions due to sales / (recoveries) | 0 | (1,111,000) | 0
Reductions due to change in intent or likelihood of sale | 0 | 0 | 0
Additions related to increases in previously recognized OTTI losses | 0 | 0 | 0
Reductions due to increases in expected cash flows | 0 | 0 | 0
End of period | 0 | 0 | 1,111,000
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 64,501,000 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 5,071,000 |  |
Debt Securities, Held-to-maturity, Fair Value | 69,572,000 | 67,909,000 |
Available-for-sale Securities, Amortized Cost Basis | 674,223,000 | 701,225,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 12,414,000 | 2,310,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 589,000 | 11,261,000 |
Available-for-sale Securities, Gross Realized Gains | 875,000 | 941,000 | 773,000
Available-for-sale Securities, Gross Realized Losses | (73,000) | (40,000) | (157,000)
Available-for-sale Securities, Income Tax Expense | 233,000 | 261,000 | $ 216,000
U.S. Treasury securities and obligations of U.S. government corporations & agencies |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 97,088,000 |  |
After 1 through 5 years | 10,232,000 |  |
After 5 through 10 years | 0 |  |
After ten years | 0 |  |
Fair Value | 107,320,000 | 198,649,000 |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 64,511,000 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 5,031,000 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 0 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost | 0 |  |
Held-to-maturity, at amortized cost (estimated fair value of $69,572 and $67,909 at December 31, 2019 and 2018, respectively) | 69,542,000 | 69,436,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 23,375,000 | 16,095,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (60,000) | (148,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 105,549,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | (3,087,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 23,375,000 | 121,644,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (60,000) | $ (3,235,000) |
Number of AFS securities in Unrealized Loss Positions | securities |  | 23 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 14,996,000 | $ 19,683,000 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (25,000) | (147,000) |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 24,565,000 | 48,226,000 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (44,000) | (1,380,000) |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 39,561,000 | 67,909,000 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (69,000) | $ (1,527,000) |
Number of HTM securities in Unrealized Loss Positions | securities | 4 | 9 |
Credit losses on trust preferred securities held [Abstract] |  |  |
Debt Securities, Held-to-maturity, Fair Value | $ 69,572,000 | $ 67,909,000 |
Available-for-sale Securities, Amortized Cost Basis | 106,428,000 | 201,380,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 952,000 | 504,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 60,000 | 3,235,000 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 99,000 | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 69,000 | 1,527,000 |
Obligations of states and political subdivisions |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 30,565,000 |  |
After 1 through 5 years | 68,896,000 |  |
After 5 through 10 years | 77,953,000 |  |
After ten years | 1,019,000 |  |
Fair Value | 178,433,000 | 192,579,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 3,469,000 | 38,782,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (16,000) | (450,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 347,000 | 42,741,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,000) | (1,390,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 3,816,000 | 81,523,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (17,000) | (1,840,000) |
Number of AFS securities in Unrealized Loss Positions | securities | 1 |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (84) |
Credit losses on trust preferred securities held [Abstract] |  |  |
Available-for-sale Securities, Amortized Cost Basis | $ 172,460,000 | 193,195,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 5,990,000 | 1,224,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 17,000 | 1,840,000 |
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 1,517,000 |  |
After 1 through 5 years | 296,145,000 |  |
After 5 through 10 years | 98,464,000 |  |
After ten years | 0 |  |
Fair Value | 396,126,000 | 298,672,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 67,080,000 | 81,435,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (322,000) | (1,150,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 20,888,000 | 171,321,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (190,000) | (5,036,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 87,968,000 | 252,756,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (512,000) | $ (6,186,000) |
Number of AFS securities in Unrealized Loss Positions | securities | 14 | 69 |
Credit losses on trust preferred securities held [Abstract] |  |  |
Available-for-sale Securities, Amortized Cost Basis | $ 391,307,000 | $ 304,372,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 5,331,000 | 486,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 512,000 | 6,186,000 |
Other securities |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 2,002,000 |  |
After 1 through 5 years | 1,754,000 |  |
After 5 through 10 years | 0 |  |
After ten years | 413,000 |  |
Fair Value | 4,169,000 | 2,374,000 |
Credit losses on trust preferred securities held [Abstract] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 4,028,000 | 2,278,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 141,000 | 96,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 0 | $ 0 |

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- Definition The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security. + References No definition available. + Details
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- Definition The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature after one through five years. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security. + References No definition available. + Details
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- Definition The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature after five through ten years. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security. + References No definition available. + Details
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- Definition The yield on an available for sale government security, when the effect of reduced taxes are taken into account, for securities that mature after ten years. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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- Definition The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284393-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284393-111563 + Details
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- Definition This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held due to increases in cash flows expected to be collected and recognized over the remaining life of the security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284393-111563 + Details
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