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Investment Securities, Part II (Details) | 3 Months Ended |
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Mar. 31, 2019 USD ($) securities | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | $ 175,644,000 |  |
After 1 through 5 years | 344,695,000 |  |
After 5 through 10 years | 174,040,000 |  |
After ten years | 1,239,000 |  |
Fair Value | $ 695,618,000 |  | $ 692,274,000
Available-for-sale, Weighted Average Yield, Maturities Year One (in hundredths) | 2.64% |  |
Available-for-sale , Weighted Average Yield, Maturities After 1 through 5 Years (in hundredths) | 2.85% |  |
Available-for-sale, Weighted Average Yield, Maturities After 5 through 10 Years (in hundredths) | 2.92% |  |
Available-for-sale , Weighted Average Yield, Maturities After 10 Years (in hundredths) | 3.06% |  |
Available-for-sale , Weighted Average Yield, Maturities (in hundredths) | 2.82% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities Year One (in hundredths) | 2.79% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After 1 through 5 Years (in hundredths) | 3.12% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After 5 through 10 years (in hundredths) | 3.43% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After Ten Years (in hundredths) | 4.07% |  |
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 | $ 69,462,000 |  | 69,436,000
Held To Maturity Weighted Average Yield Maturities Year One | 1.83% |  |
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 | 1.83% |  |
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% |  |
Percentage investment book value exceeds total stockholders' equity (in hundredths) | 10.00% |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less than 12 months, Fair Value | $ 4,332,000 |  | 136,312,000
Less than 12 months, Unrealized Losses | (8,000) |  | (1,748,000)
12 months or longer, Fair Value | 312,533,000 |  | 319,611,000
12 months or longer, Unrealized losses | (3,575,000) |  | (9,513,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 316,865,000 |  | 455,923,000
Total Unrealized Losses | 3,583,000 |  | 11,261,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 3,583,000 |  | 11,261,000
Credit losses on trust preferred securities held [Abstract] |  |  |
Beginning of period | 0 | $ 1,111,000 |
Additions related to OTTI losses not previously recognized | 0 | 0 |
Reductions due to sales / (recoveries) | 0 | 0 |
Reductions due to change in intent or likelihood of sale | 0 | 0 |
Additions related to increases in previously recognized OTTI losses | 0 | 0 |
Reductions due to increases in expected cash flows | 0 | 0 |
End of period | 0 | 1,111,000 |
Debt and Equity Securities, Gain (Loss) | 54,000 | $ 20,000 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |  |
Debt Securities, Available-for-sale, Restricted | 574,000,000 |  | 628,000,000
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 | 148,125,000 |  |
After 1 through 5 years | 42,602,000 |  |
After 5 through 10 years | 0 |  |
After ten years | 0 |  |
Fair Value | 190,727,000 |  | 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 | 49,940,000 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 19,522,000 |  |
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 |  |
Debt Securities, Held-to-maturity | 69,462,000 |  | 69,436,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less than 12 months, Fair Value | 998,000 |  | 16,095,000
Less than 12 months, Unrealized Losses | 0 |  | (148,000)
12 months or longer, Fair Value | 82,772,000 |  | 105,549,000
12 months or longer, Unrealized losses | (1,044,000) |  | (3,087,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 83,770,000 |  | 121,644,000
Total Unrealized Losses | $ 1,044,000 |  | $ 3,235,000
Number of securities in Unrealized Loss Positions | securities | 19 |  | 23
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 1,044,000 |  | $ 3,235,000
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 | 0 |  | 19,683,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 0 |  | (147,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 63,775,000 |  | 48,226,000
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (730,000) |  | (1,380,000)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 63,775,000 |  | 67,909,000
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (730,000) |  | $ (1,527,000)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities | 13 |  | 9
Obligations of states and political subdivisions |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | $ 26,862,000 |  |
After 1 through 5 years | 85,494,000 |  |
After 5 through 10 years | 77,798,000 |  |
After ten years | 949,000 |  |
Fair Value | 191,103,000 |  | $ 192,579,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less than 12 months, Fair Value | 1,382,000 |  | 38,782,000
Less than 12 months, Unrealized Losses | (3,000) |  | (450,000)
12 months or longer, Fair Value | 30,225,000 |  | 42,741,000
12 months or longer, Unrealized losses | (462,000) |  | (1,390,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 31,607,000 |  | 81,523,000
Total Unrealized Losses | $ 465,000 |  | $ 1,840,000
Number of securities in Unrealized Loss Positions | securities | 61 |  | 84
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 465,000 |  | $ 1,840,000
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 30,225,000 |  | 42,741,000
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (462,000) |  | (1,390,000)
Mortgage-backed securities: GSE residential |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 657,000 |  |
After 1 through 5 years | 214,585,000 |  |
After 5 through 10 years | 96,242,000 |  |
After ten years | 0 |  |
Fair Value | 311,484,000 |  | 298,672,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less than 12 months, Fair Value | 1,952,000 |  | 81,435,000
Less than 12 months, Unrealized Losses | (5,000) |  | (1,150,000)
12 months or longer, Fair Value | 199,536,000 |  | 171,321,000
12 months or longer, Unrealized losses | (2,069,000) |  | (5,036,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 201,488,000 |  | 252,756,000
Total Unrealized Losses | $ 2,074,000 |  | $ 6,186,000
Number of securities in Unrealized Loss Positions | securities | 77 |  | 69
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 2,074,000 |  | $ 6,186,000
Trust preferred securities |  |  |
Credit losses on trust preferred securities held [Abstract] |  |  |
Debt and Equity Securities, Gain (Loss) | 846,000 |  |
Other securities |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 0 |  |
After 1 through 5 years | 2,014,000 |  |
After 5 through 10 years | 0 |  |
After ten years | 290,000 |  |
Fair Value | 2,304,000 |  | 2,374,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
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 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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