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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | $ 149,683 | $ 149,640
Available-for-sale, Gross Unrealized Gains | 4,059 | 1,413
Available-for-sale, Gross Unrealized Losses | (4) | (93)
Available-for-sale, Estimated Fair Value | 153,738 | 150,960
Amortized Cost | 920,687 | 772,975
Held-to-maturity, Amortized Cost | 920,687 |
Held-to-maturity, Gross Unrealized Gains | 19,053 | 8,224
Held-to-maturity, Gross Unrealized Losses | (11,158) | (3,909)
Estimated Fair Value | 928,582 | 777,290
Allowance for Credit Losses | (2,529) | 0
Total, Amortized Cost | 1,070,370 | 922,615
Total, Gross Unrealized Gains | 23,112 | 9,637
Total, Gross Unrealized Losses | (11,162) | (4,002)
Total, Estimated Fair Value | 1,082,320 | 928,250
Investment securities |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 149,286 | 149,145
Available-for-sale, Gross Unrealized Gains | 4,051 | 1,408
Available-for-sale, Gross Unrealized Losses | (4) | (93)
Available-for-sale, Estimated Fair Value | 153,333 | 150,460
Amortized Cost |  | 208,961
Held-to-maturity, Amortized Cost | 320,682 |
Held-to-maturity, Gross Unrealized Gains | 3,578 | 2,384
Held-to-maturity, Gross Unrealized Losses | (8,993) | (2,629)
Estimated Fair Value | 315,267 | 208,716
Allowance for Credit Losses | (1,686) |
U.S. government and agency obligations | Investment securities |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 149,261 | 149,120
Available-for-sale, Gross Unrealized Gains | 4,051 | 1,408
Available-for-sale, Gross Unrealized Losses | (4) | (93)
Available-for-sale, Estimated Fair Value | 153,308 | 150,435
Amortized Cost |  | 4,984
Held-to-maturity, Amortized Cost | 6,238 |
Held-to-maturity, Gross Unrealized Gains | 54 | 14
Held-to-maturity, Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 6,292 | 4,998
Allowance for Credit Losses | 0 |
State and municipal obligations | Investment securities |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 25 | 25
Available-for-sale, Gross Unrealized Gains | 0 | 0
Available-for-sale, Gross Unrealized Losses | 0 | 0
Available-for-sale, Estimated Fair Value | 25 | 25
Amortized Cost |  | 124,430
Held-to-maturity, Amortized Cost | 232,167 |
Held-to-maturity, Gross Unrealized Gains | 3,014 | 1,537
Held-to-maturity, Gross Unrealized Losses | (425) | (208)
Estimated Fair Value | 234,756 | 125,759
Allowance for Credit Losses | (35) |
Corporate debt securities |  |
Securities Financing Transaction [Line Items] |  |
Amortized Cost | 38,332 |
Estimated Fair Value | 31,292 |
Corporate debt securities | Investment securities |  |
Securities Financing Transaction [Line Items] |  |
Amortized Cost |  | 79,547
Held-to-maturity, Amortized Cost | 82,277 |
Held-to-maturity, Gross Unrealized Gains | 510 | 833
Held-to-maturity, Gross Unrealized Losses | (8,568) | (2,421)
Estimated Fair Value | 74,219 | 77,959
Allowance for Credit Losses | (1,651) |
Mortgage-backed securities |  |
Securities Financing Transaction [Line Items] |  |
Amortized Cost |  | 564,014
Held-to-maturity, Amortized Cost | 600,005 |
Held-to-maturity, Gross Unrealized Gains | 15,475 | 5,840
Held-to-maturity, Gross Unrealized Losses | (2,165) | (1,280)
Estimated Fair Value | 613,315 | 568,574
Allowance for Credit Losses | (843) | 0
Mortgage-backed securities | FHLMC |  |
Securities Financing Transaction [Line Items] |  |
Amortized Cost |  | 206,985
Held-to-maturity, Amortized Cost | 198,263 |
Held-to-maturity, Gross Unrealized Gains | 5,835 | 2,221
Held-to-maturity, Gross Unrealized Losses | (30) | (524)
Estimated Fair Value | 204,068 | 208,682
Allowance for Credit Losses | 0 |
Mortgage-backed securities | FNMA |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 397 | 495
Available-for-sale, Gross Unrealized Gains | 8 | 5
Available-for-sale, Gross Unrealized Losses | 0 | 0
Available-for-sale, Estimated Fair Value | 405 | 500
Amortized Cost |  | 244,428
Held-to-maturity, Amortized Cost | 240,839 |
Held-to-maturity, Gross Unrealized Gains | 7,604 | 2,680
Held-to-maturity, Gross Unrealized Losses | (165) | (493)
Estimated Fair Value | 248,278 | 246,615
Allowance for Credit Losses | 0 |
Mortgage-backed securities | GNMA |  |
Securities Financing Transaction [Line Items] |  |
Amortized Cost |  | 110,661
Held-to-maturity, Amortized Cost | 104,891 |
Held-to-maturity, Gross Unrealized Gains | 2,027 | 939
Held-to-maturity, Gross Unrealized Losses | (416) | (212)
Estimated Fair Value | 106,502 | 111,388
Allowance for Credit Losses | 0 |
Mortgage-backed securities | SBA |  |
Securities Financing Transaction [Line Items] |  |
Amortized Cost |  | 1,940
Held-to-maturity, Amortized Cost | 6,108 |
Held-to-maturity, Gross Unrealized Gains | 9 | 0
Held-to-maturity, Gross Unrealized Losses | (46) | (51)
Estimated Fair Value | 6,071 | $ 1,889
Allowance for Credit Losses | 0 |
Mortgage-backed securities | CMO |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, Amortized Cost | 49,904 |
Held-to-maturity, Gross Unrealized Gains | 0 |
Held-to-maturity, Gross Unrealized Losses | (1,508) |
Estimated Fair Value | 48,396 |
Allowance for Credit Losses | $ (843) |

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