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Investment (Held-to-Maturity) Securities (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, Amortized Cost |  | $ 293,418 | $ 355,187
Investment Securities, fair value |  | 314,402 | 367,298
Investment Securities, Gross Unrealized Gain |  | 21,285 | 14,408
Investment Securities, Gross Unrealized Loss |  | (301) | (2,297)
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract] |  |  |
Investment Securities, Amortized Cost |  | 293,418 | 355,187
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, fair value |  | $ 314,402 | $ 367,298
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 17 | 146
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 1,276 | $ 31,627
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 9,747 | 94,802
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 11,023 | 126,429
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses |  | 2 | 133
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses |  | 299 | 2,164
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 301 | 2,297
Fixed maturity securities [Member] |  |  |
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract] |  |  |
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value |  | 41,670 |
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value |  | 84,027 |
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value |  | 144,705 |
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value |  | 12,340 |
Investment Securities, Debt Maturities, Single Maturity Date, Carrying Value |  | 282,742 |
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, Less than One Year, Fair Value |  | 41,840 |
Investment Securities, Debt Maturities, One to Five Years, Fair Value |  | 87,883 |
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 161,178 |
Investment Securities, Debt Maturities, Over Ten Years, Fair Value |  | 12,337 |
Investment Securities, Debt Maturities, Single Maturity Date, Fair value |  | $ 303,238 |
Investment Securities, Debt Maturities, Weighted Average Maturity | [1] | 5.10 |
Municipal and other tax-exempt securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, Amortized Cost |  | $ 93,653 | 137,296
Investment Securities, fair value |  | 96,897 | 138,562
Investment Securities, Gross Unrealized Gain |  | 3,250 | 1,858
Investment Securities, Gross Unrealized Loss |  | (6) | (592)
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract] |  |  |
Investment Securities, Amortized Cost |  | 93,653 | 137,296
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, fair value |  | $ 96,897 | $ 138,562
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 4 | 72
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 1,001 | $ 18,255
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 1,706 | 66,141
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 2,707 | 84,396
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses |  | 1 | 69
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses |  | 5 | 523
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 6 | 592
Other debt securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, Amortized Cost |  | 189,089 | 205,279
Investment Securities, fair value |  | 206,341 | 215,966
Investment Securities, Gross Unrealized Gain |  | 17,547 | 12,257
Investment Securities, Gross Unrealized Loss |  | (295) | (1,570)
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract] |  |  |
Investment Securities, Amortized Cost |  | 189,089 | 205,279
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, fair value |  | $ 206,341 | $ 215,966
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 13 | 72
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 275 | $ 13,372
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 8,041 | 23,028
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 8,316 | 36,400
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses |  | 1 | 64
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses |  | 294 | 1,506
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 295 | 1,570
Residential agency mortgage-backed securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, Amortized Cost |  | 10,676 | 12,612
Investment Securities, fair value |  | 11,164 | 12,770
Investment Securities, Gross Unrealized Gain |  | 488 | 293
Investment Securities, Gross Unrealized Loss |  | 0 | (135)
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract] |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying value | [2] | 10,676 |
Investment Securities, Amortized Cost |  | 10,676 | 12,612
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Fair value |  | 11,164 |
Investment Securities, fair value |  | $ 11,164 | $ 12,770
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 5 years |
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 0 | 2
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 0 | $ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 0 | 5,633
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 0 | 5,633
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses |  | 0 | 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses |  | 0 | 135
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ 0 | $ 135
[1] | Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
[2] | The average expected lives of residential mortgage-backed securities were 5.0 years based upon current prepayment assumptions.

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Data Type: | na
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