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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
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Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | $ 149,172,000 | $ 149,640,000
Available-for-sale, Gross Unrealized Gains | 4,067,000 | 1,413,000
Available-for-sale, Gross Unrealized Losses | 0 | (93,000)
Available-for-sale, Estimated Fair Value | 153,239,000 | 150,960,000
Allowance for Credit Losses | 0 |
Held-to-maturity, Amortized Cost | 874,119,000 |
Amortized Cost | 874,119,000 | 772,975,000
Held-to-maturity, Gross Unrealized Gains | 28,016,000 | 8,224,000
Held-to-maturity, Gross Unrealized Losses | (6,238,000) | (3,909,000)
Estimated Fair Value | 895,897,000 | 777,290,000
Allowance for Credit Losses | (2,446,000) | 0
Total, Amortized Cost | 1,023,291,000 | 922,615,000
Total, Gross Unrealized Gains | 32,083,000 | 9,637,000
Total, Gross Unrealized Losses | (6,238,000) | (4,002,000)
Total, Estimated Fair Value | 1,049,136,000 | 928,250,000
Investment securities |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 148,862,000 | 149,145,000
Available-for-sale, Gross Unrealized Gains | 4,063,000 | 1,408,000
Available-for-sale, Gross Unrealized Losses | 0 | (93,000)
Available-for-sale, Estimated Fair Value | 152,925,000 | 150,460,000
Allowance for Credit Losses | 0 |
Held-to-maturity, Amortized Cost | 309,565,000 |
Amortized Cost |  | 208,961,000
Held-to-maturity, Gross Unrealized Gains | 9,638,000 | 2,384,000
Held-to-maturity, Gross Unrealized Losses | (6,065,000) | (2,629,000)
Estimated Fair Value | 313,138,000 | 208,716,000
Allowance for Credit Losses | (1,617,000) |
U.S. government and agency obligations | Investment securities |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 138,460,000 | 149,120,000
Available-for-sale, Gross Unrealized Gains | 4,004,000 | 1,408,000
Available-for-sale, Gross Unrealized Losses | 0 | (93,000)
Available-for-sale, Estimated Fair Value | 142,464,000 | 150,435,000
Allowance for Credit Losses | 0 |
Held-to-maturity, Amortized Cost | 6,242,000 |
Amortized Cost |  | 4,984,000
Held-to-maturity, Gross Unrealized Gains | 38,000 | 14,000
Held-to-maturity, Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 6,280,000 | 4,998,000
Allowance for Credit Losses | 0 |
State and municipal obligations | Investment securities |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 2,402,000 | 25,000
Available-for-sale, Gross Unrealized Gains | 0 | 0
Available-for-sale, Gross Unrealized Losses | 0 | 0
Available-for-sale, Estimated Fair Value | 2,402,000 | 25,000
Allowance for Credit Losses | 0 |
Held-to-maturity, Amortized Cost | 227,046,000 |
Amortized Cost |  | 124,430,000
Held-to-maturity, Gross Unrealized Gains | 8,701,000 | 1,537,000
Held-to-maturity, Gross Unrealized Losses | (185,000) | (208,000)
Estimated Fair Value | 235,562,000 | 125,759,000
Allowance for Credit Losses | (35,000) |
Corporate debt securities |  |
Securities Financing Transaction [Line Items] |  |
Amortized Cost | 38,332,000 |
Estimated Fair Value | 33,208,000 |
Corporate debt securities | Investment securities |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 8,000,000 |
Available-for-sale, Gross Unrealized Gains | 59,000 |
Available-for-sale, Gross Unrealized Losses | 0 |
Available-for-sale, Estimated Fair Value | 8,059,000 |
Held-to-maturity, Amortized Cost | 76,277,000 |
Amortized Cost |  | 79,547,000
Held-to-maturity, Gross Unrealized Gains | 899,000 | 833,000
Held-to-maturity, Gross Unrealized Losses | (5,880,000) | (2,421,000)
Estimated Fair Value | 71,296,000 | 77,959,000
Allowance for Credit Losses | (1,582,000) |
Mortgage-backed securities |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, Amortized Cost | 564,554,000 |
Amortized Cost |  | 564,014,000
Held-to-maturity, Gross Unrealized Gains | 18,378,000 | 5,840,000
Held-to-maturity, Gross Unrealized Losses | (173,000) | (1,280,000)
Estimated Fair Value | 582,759,000 | 568,574,000
Allowance for Credit Losses | (829,000) | 0
Mortgage-backed securities | FHLMC |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, Amortized Cost | 190,352,000 |
Amortized Cost |  | 206,985,000
Held-to-maturity, Gross Unrealized Gains | 6,548,000 | 2,221,000
Held-to-maturity, Gross Unrealized Losses | (33,000) | (524,000)
Estimated Fair Value | 196,867,000 | 208,682,000
Allowance for Credit Losses | 0 |
Mortgage-backed securities | FNMA |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 310,000 | 495,000
Available-for-sale, Gross Unrealized Gains | 4,000 | 5,000
Available-for-sale, Gross Unrealized Losses | 0 | 0
Available-for-sale, Estimated Fair Value | 314,000 | 500,000
Allowance for Credit Losses | 0 |
Held-to-maturity, Amortized Cost | 226,452,000 |
Amortized Cost |  | 244,428,000
Held-to-maturity, Gross Unrealized Gains | 8,673,000 | 2,680,000
Held-to-maturity, Gross Unrealized Losses | (29,000) | (493,000)
Estimated Fair Value | 235,096,000 | 246,615,000
Allowance for Credit Losses | 0 |
Mortgage-backed securities | GNMA |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, Amortized Cost | 92,076,000 |
Amortized Cost |  | 110,661,000
Held-to-maturity, Gross Unrealized Gains | 2,710,000 | 939,000
Held-to-maturity, Gross Unrealized Losses | (20,000) | (212,000)
Estimated Fair Value | 94,766,000 | 111,388,000
Allowance for Credit Losses | 0 |
Mortgage-backed securities | SBA |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, Amortized Cost | 5,849,000 |
Amortized Cost |  | 1,940,000
Held-to-maturity, Gross Unrealized Gains | 0 | 0
Held-to-maturity, Gross Unrealized Losses | (61,000) | (51,000)
Estimated Fair Value | 5,788,000 | $ 1,889,000
Allowance for Credit Losses | 0 |
Mortgage-backed securities | CMO |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, Amortized Cost | 49,825,000 |
Held-to-maturity, Gross Unrealized Gains | 447,000 |
Held-to-maturity, Gross Unrealized Losses | (30,000) |
Estimated Fair Value | 50,242,000 |
Allowance for Credit Losses | $ (829,000) |

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