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Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Available-for-sale: [Abstract] |  |  |
Amortized Cost | $ 610,435 |  | $ 674,223
Gross Unrealized Gains | 11,805 |  | 12,414
Gross Unrealized (Losses) | (4,439) |  | (589)
Fair Value | 617,801 |  | 686,048
Debt and Equity Securities, Gain (Loss) | 531 | $ 54 |
Held-to-maturity: [Abstract] |  |  |
Debt Securities, Held-to-maturity | 24,563 |  | 69,542
Debt Securities, Held-to-maturity, Fair Value | 24,806 |  | 69,572
Realized Investment Gains (Losses) [Abstract] |  |  |
Gross gains | 531 | 84 |
Gross losses | 0 | $ (30) |
U.S. Treasury securities and obligations of U.S. government corporations & agencies |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 56,067 |  | 106,428
Gross Unrealized Gains | 716 |  | 952
Gross Unrealized (Losses) | (94) |  | (60)
Fair Value | 56,689 |  | 107,320
Held-to-maturity: [Abstract] |  |  |
Debt Securities, Held-to-maturity | 24,563 |  | 69,542
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 243 |  | 99
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 |  | (69)
Debt Securities, Held-to-maturity, Fair Value | 24,806 |  | 69,572
Obligations of states and political subdivisions |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 167,146 |  | 172,460
Gross Unrealized Gains | 260 |  | 5,990
Gross Unrealized (Losses) | (3,904) |  | (17)
Fair Value | 163,502 |  | 178,433
Mortgage-backed securities: GSE residential |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 385,194 |  | 391,307
Gross Unrealized Gains | 10,717 |  | 5,331
Gross Unrealized (Losses) | (400) |  | (512)
Fair Value | 395,511 |  | 396,126
Other securities |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 2,028 |  | 4,028
Gross Unrealized Gains | 112 |  | 141
Gross Unrealized (Losses) | (41) |  | 0
Fair Value | $ 2,099 |  | $ 4,169

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