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Investment (Held-to-Maturity) Securities (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, Gross Amortized Cost |  | $ 274,078 | $ 293,418
Investment securities, Allowance for Credit Loss |  | (1,502) | 0
Investments securities, Amortized Cost, Net of Allowance |  | 272,576 | 293,418
Investment Securities, Fair Value |  | 296,402 | 314,402
Investment Securities, Gross Unrealized Gain |  | 22,425 | 21,285
Investment Securities, Gross Unrealized Loss |  | $ (101) | $ (301)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 10 | 17
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 232 | $ 1,276
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 5,515 | 9,747
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 5,747 | 11,023
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 1 | 2
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 100 | 299
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 101 | 301
Fixed Maturity Securities [Member] |  |  |
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value |  | 38,058 |
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value |  | 91,847 |
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value |  | 122,431 |
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value |  | 11,489 |
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value |  | 263,825 |
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, Less Than One Year, Fair Value |  | 38,380 |
Investment Securities, Debt Maturities, One to Five Years, Fair Value |  | 97,946 |
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 137,365 |
Investment Securities, Debt Maturities, Over Ten Years, Fair Value |  | 11,612 |
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value |  | $ 285,303 |
Investment Securities, Debt Maturities, Weighted Average Maturity | [1] | 5.12 |
Municipal and other tax-exempt securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, Gross Amortized Cost |  | $ 86,212 | 93,653
Investment Securities, Fair Value |  | 89,359 | 96,897
Investment Securities, Gross Unrealized Gain |  | 3,149 | 3,250
Investment Securities, Gross Unrealized Loss |  | $ (2) | $ (6)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 2 | 4
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 232 | $ 1,001
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 347 | 1,706
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 579 | 2,707
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 1 | 1
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 1 | 5
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 2 | 6
Other debt securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, Gross Amortized Cost |  | 177,613 | 189,089
Investment Securities, Fair Value |  | 195,944 | 206,341
Investment Securities, Gross Unrealized Gain |  | 18,430 | 17,547
Investment Securities, Gross Unrealized Loss |  | $ (99) | $ (295)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 8 | 13
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 0 | $ 275
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 5,168 | 8,041
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 5,168 | 8,316
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0 | 1
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 99 | 294
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 99 | 295
Residential agency mortgage-backed securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, Gross Amortized Cost |  | 10,253 | 10,676
Investment Securities, Fair Value |  | 11,099 | 11,164
Investment Securities, Gross Unrealized Gain |  | 846 | 488
Investment Securities, Gross Unrealized Loss |  | 0 | $ 0
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value | [2] | 10,253 |
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | $ 11,099 |
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 4 years 8 months 12 days |
[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 4.7 years based upon current prepayment assumptions.

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