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Investment Securities, Part II (Details) | 3 Months Ended |
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Mar. 31, 2020 USD ($) securities | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | $ 141,581,000 |  |
After 1 through 5 years | 397,120,000 |  |
After 5 through 10 years | 76,611,000 |  |
After ten years | 2,489,000 |  |
Fair Value | $ 617,801,000 |  | $ 686,048,000
Available-for-sale, Weighted Average Yield, Maturities Year One (in hundredths) | 2.42% |  |
Available-for-sale , Weighted Average Yield, Maturities After 1 through 5 Years (in hundredths) | 2.67% |  |
Available-for-sale, Weighted Average Yield, Maturities After 5 through 10 Years (in hundredths) | 2.93% |  |
Available-for-sale , Weighted Average Yield, Maturities After 10 Years (in hundredths) | 2.88% |  |
Available-for-sale , Weighted Average Yield, Maturities (in hundredths) | 2.65% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities Year One (in hundredths) | 2.63% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After 1 through 5 Years (in hundredths) | 2.87% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After 5 through 10 years (in hundredths) | 3.93% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After Ten Years (in hundredths) | 3.79% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities (in hundredths) | 2.96% |  |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Debt Securities, Held-to-maturity | $ 24,563,000 |  | 69,542,000
Held To Maturity Weighted Average Yield Maturities Year One | 1.93% |  |
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 | 1.96% |  |
Held To Maturity Tax Equivalent Yield Maturities Year One | 1.93% |  |
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 | 1.96% |  |
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, Qualitative Disclosure [Abstract] |  |  |
Less than 12 months, Fair Value | $ 177,861,000 |  | 93,924,000
Less than 12 months, Unrealized Losses | (4,354,000) |  | (398,000)
12 months or longer, Fair Value | 3,679,000 |  | 21,235,000
12 months or longer, Unrealized losses | (85,000) |  | (191,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 181,540,000 |  | 115,159,000
Total Unrealized Losses | 4,439,000 |  | 589,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 4,439,000 |  | 589,000
Credit losses on trust preferred securities held [Abstract] |  |  |
Debt and Equity Securities, Gain (Loss) | 531,000 | $ 54,000 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |  |
Debt Securities, Available-for-sale, Restricted | 582,000,000 |  | 688,000,000
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 | 41,026,000 |  |
After 1 through 5 years | 15,663,000 |  |
After 5 through 10 years | 0 |  |
After ten years | 0 |  |
Fair Value | 56,689,000 |  | 107,320,000
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 | 19,536,000 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 5,027,000 |  |
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 | 24,563,000 |  | 69,542,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Less than 12 months, Fair Value | 5,802,000 |  | 23,375,000
Less than 12 months, Unrealized Losses | (94,000) |  | (60,000)
12 months or longer, Fair Value | 0 |  | 0
12 months or longer, Unrealized losses | 0 |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 5,802,000 |  | 23,375,000
Total Unrealized Losses | 94,000 |  | 60,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 94,000 |  | 60,000
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 |  |  | 14,996,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  |  | (25,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  |  | 24,565,000
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |  | (44,000)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  |  | 39,561,000
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  |  | $ (69,000)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities |  |  | 4
Obligations of states and political subdivisions |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 26,677,000 |  |
After 1 through 5 years | 69,512,000 |  |
After 5 through 10 years | 65,164,000 |  |
After ten years | 2,149,000 |  |
Fair Value | 163,502,000 |  | $ 178,433,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Less than 12 months, Fair Value | 119,614,000 |  | 3,469,000
Less than 12 months, Unrealized Losses | (3,904,000) |  | (16,000)
12 months or longer, Fair Value | 0 |  | 347,000
12 months or longer, Unrealized losses | 0 |  | (1,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 119,614,000 |  | 3,816,000
Total Unrealized Losses | 3,904,000 |  | $ 17,000
Number of securities in Unrealized Loss Positions | securities |  |  | 1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 3,904,000 |  | $ 17,000
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 |  |  | 347,000
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |  | (1,000)
Mortgage-backed securities: GSE residential |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 73,878,000 |  |
After 1 through 5 years | 310,186,000 |  |
After 5 through 10 years | 11,447,000 |  |
After ten years | 0 |  |
Fair Value | 395,511,000 |  | 396,126,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Less than 12 months, Fair Value | 51,736,000 |  | 67,080,000
Less than 12 months, Unrealized Losses | (315,000) |  | (322,000)
12 months or longer, Fair Value | 3,679,000 |  | 20,888,000
12 months or longer, Unrealized losses | (85,000) |  | (190,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 55,415,000 |  | 87,968,000
Total Unrealized Losses | $ 400,000 |  | $ 512,000
Number of securities in Unrealized Loss Positions | securities | 5 |  | 14
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 400,000 |  | $ 512,000
Other securities |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 0 |  |
After 1 through 5 years | 1,759,000 |  |
After 5 through 10 years | 0 |  |
After ten years | 340,000 |  |
Fair Value | 2,099,000 |  | 4,169,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Less than 12 months, Fair Value | 709,000 |  |
Less than 12 months, Unrealized Losses | (41,000) |  |
12 months or longer, Fair Value | 0 |  |
12 months or longer, Unrealized losses | 0 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 709,000 |  |
Total Unrealized Losses | 41,000 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 41,000 |  | $ 0

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