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Investment (Held-to-Maturity) Securities (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investments Securities, Amortized Cost |  | $ 327,677 | $ 355,187
Investment Securities, fair value |  | 347,015 | 367,298
Investment Securities, Gross Unrealized Gain |  | 20,033 | 14,408
Investment Securities, Gross Unrealized Loss |  | (695) | (2,297)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |
Investments Securities, Debt Maturities, Amortized Cost |  | 327,677 | 355,187
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, Fair Value |  | $ 347,015 | $ 367,298
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 49 | 146
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 25 | $ 31,627
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 30,040 | 94,802
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 30,065 | 126,429
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 1 | 133
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 694 | 2,164
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 695 | 2,297
Fixed Maturity Securities [Member] |  |  |
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value |  | 51,600 |
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value |  | 104,247 |
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value |  | 144,405 |
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value |  | 15,826 |
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value |  | 316,078 |
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, Less Than One Year, Fair Value |  | 51,791 |
Investment Securities, Debt Maturities, One to Five Years, Fair Value |  | 108,001 |
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 159,416 |
Investment Securities, Debt Maturities, Over Ten Years, Fair Value |  | 15,708 |
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value |  | $ 334,916 |
Investment Securities, Debt Maturities, Weighted Average Maturity | [1] | 5.03 |
Municipal and other tax-exempt securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investments Securities, Amortized Cost |  | $ 124,822 | 137,296
Investment Securities, fair value |  | 128,009 | 138,562
Investment Securities, Gross Unrealized Gain |  | 3,221 | 1,858
Investment Securities, Gross Unrealized Loss |  | (34) | (592)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |
Investments Securities, Debt Maturities, Amortized Cost |  | 124,822 | 137,296
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, Fair Value |  | $ 128,009 | $ 138,562
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 25 | 72
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 0 | $ 18,255
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 16,433 | 66,141
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 16,433 | 84,396
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0 | 69
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 34 | 523
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 34 | 592
Other debt securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investments Securities, Amortized Cost |  | 191,256 | 205,279
Investment Securities, fair value |  | 206,907 | 215,966
Investment Securities, Gross Unrealized Gain |  | 16,312 | 12,257
Investment Securities, Gross Unrealized Loss |  | (661) | (1,570)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |
Investments Securities, Debt Maturities, Amortized Cost |  | 191,256 | 205,279
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, Fair Value |  | $ 206,907 | $ 215,966
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 24 | 72
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 25 | $ 13,372
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 13,607 | 23,028
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 13,632 | 36,400
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 1 | 64
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 660 | 1,506
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 661 | 1,570
Residential agency mortgage-backed securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investments Securities, Amortized Cost |  | 11,599 | 12,612
Investment Securities, fair value |  | 12,099 | 12,770
Investment Securities, Gross Unrealized Gain |  | 500 | 293
Investment Securities, Gross Unrealized Loss |  | 0 | (135)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value | [2] | 11,599 |
Investments Securities, Debt Maturities, Amortized Cost |  | 11,599 | 12,612
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | 12,099 |
Investment Securities, Debt Maturities, Fair Value |  | $ 12,099 | $ 12,770
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 4 years 7 months 6 days |
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  | 2
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  |  | $ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  |  | 5,633
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  |  | 5,633
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  |  | 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |  | 135
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  |  | $ 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 4.6 years based upon current prepayment assumptions.

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