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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Securities Financing Transaction [Line Items] |  |
Available-for-sale, amortized cost | $ 180,154,000 | $ 149,640,000
Available-for-sale, gross unrealized gains | 3,154,000 | 1,413,000
Available-for-sale, gross unrealized losses | (6,000) | (93,000)
Available-for-sale, estimated fair value | 183,302,000 | 150,960,000
Allowance for Credit Losses | 0 |
Held-to-maturity, gross unrealized gains | 942,314,000 | 772,975,000
Held-to-maturity, gross unrealized losses | 29,378,000 | 8,224,000
Held-to-maturity, Gross Unrealized Losses | (3,226,000) | (3,909,000)
Estimated Fair Value | 968,466,000 | 777,290,000
Allowance for Credit Losses | (1,715,000) | 0
Total, Amortized Cost | 1,122,468,000 | 922,615,000
Total, Gross Unrealized Gains | 32,532,000 | 9,637,000
Total, Gross Unrealized Losses | (3,232,000) | (4,002,000)
Total, Estimated Fair Value | 1,151,768,000 |
Debt Securities |  | 928,250,000
Investment securities: |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, amortized cost | 179,964,000 | 149,145,000
Available-for-sale, gross unrealized gains | 3,152,000 | 1,408,000
Available-for-sale, gross unrealized losses | (6,000) | (93,000)
Available-for-sale, estimated fair value | 183,110,000 | 150,460,000
Allowance for Credit Losses | 0 |
Held-to-maturity, gross unrealized gains | 310,710,000 | 208,961,000
Held-to-maturity, gross unrealized losses | 13,115,000 | 2,384,000
Held-to-maturity, Gross Unrealized Losses | (2,883,000) | (2,629,000)
Estimated Fair Value | 320,942,000 | 208,716,000
Allowance for Credit Losses | (1,598,000) |
U.S. government and agency obligations | Investment securities: |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, amortized cost | 173,790,000 | 149,120,000
Available-for-sale, gross unrealized gains | 3,152,000 | 1,408,000
Available-for-sale, gross unrealized losses | (2,000) | (93,000)
Available-for-sale, estimated fair value | 176,940,000 | 150,435,000
Allowance for Credit Losses | 0 |
Held-to-maturity, gross unrealized gains |  | 4,984,000
Held-to-maturity, gross unrealized losses |  | 14,000
Held-to-maturity, Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 4,998,000
Collateralized loan obligations | Investment securities: |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, amortized cost | 6,174,000 |
Available-for-sale, gross unrealized gains | 0 |
Available-for-sale, gross unrealized losses | (4,000) |
Available-for-sale, estimated fair value | 6,170,000 |
Allowance for Credit Losses | 0 |
Corporate debt securities |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, gross unrealized gains | 38,332,000 |
Estimated Fair Value | 35,935,000 |
Corporate debt securities | Investment securities: |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, gross unrealized gains | 72,305,000 | 79,547,000
Held-to-maturity, gross unrealized losses | 1,615,000 | 833,000
Held-to-maturity, Gross Unrealized Losses | (2,652,000) | (2,421,000)
Estimated Fair Value | 71,268,000 | 77,959,000
Allowance for Credit Losses | (1,550,000) |
Mortgage-backed Securities |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, gross unrealized gains | 631,604,000 | 564,014,000
Held-to-maturity, gross unrealized losses | 16,263,000 | 5,840,000
Held-to-maturity, Gross Unrealized Losses | (343,000) | (1,280,000)
Estimated Fair Value | 647,524,000 | 568,574,000
Allowance for Credit Losses | (117,000) | 0
Mortgage-backed Securities | FHLMC |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, gross unrealized gains | 232,942,000 | 206,985,000
Held-to-maturity, gross unrealized losses | 5,383,000 | 2,221,000
Held-to-maturity, Gross Unrealized Losses | (124,000) | (524,000)
Estimated Fair Value | 238,201,000 | 208,682,000
Allowance for Credit Losses | 0 |
Mortgage-backed Securities | FNMA |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, amortized cost | 190,000 | 495,000
Available-for-sale, gross unrealized gains | 2,000 | 5,000
Available-for-sale, gross unrealized losses | 0 | 0
Available-for-sale, estimated fair value | 192,000 | 500,000
Allowance for Credit Losses | 0 |
Held-to-maturity, gross unrealized gains | 293,615,000 | 244,428,000
Held-to-maturity, gross unrealized losses | 7,640,000 | 2,680,000
Held-to-maturity, Gross Unrealized Losses | (147,000) | (493,000)
Estimated Fair Value | 301,108,000 | 246,615,000
Allowance for Credit Losses | 0 |
Mortgage-backed Securities | GNMA |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, gross unrealized gains | 67,334,000 | 110,661,000
Held-to-maturity, gross unrealized losses | 2,014,000 | 939,000
Held-to-maturity, Gross Unrealized Losses | (12,000) | (212,000)
Estimated Fair Value | 69,336,000 | 111,388,000
Allowance for Credit Losses | 0 |
Mortgage-backed Securities | SBA |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, gross unrealized gains | 5,392,000 | 1,940,000
Held-to-maturity, gross unrealized losses | 0 | 0
Held-to-maturity, Gross Unrealized Losses | (60,000) | (51,000)
Estimated Fair Value | 5,332,000 | 1,889,000
Allowance for Credit Losses | 0 |
Mortgage-backed Securities | CMO |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, gross unrealized gains | 32,321,000 |
Held-to-maturity, gross unrealized losses | 1,226,000 |
Held-to-maturity, Gross Unrealized Losses | 0 |
Estimated Fair Value | 33,547,000 |
Allowance for Credit Losses | (117,000) |
State and municipal obligations | Investment securities: |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, amortized cost |  | 25,000
Available-for-sale, gross unrealized gains |  | 0
Available-for-sale, gross unrealized losses |  | 0
Available-for-sale, estimated fair value |  | 25,000
Held-to-maturity, gross unrealized gains | 238,405,000 | 124,430,000
Held-to-maturity, gross unrealized losses | 11,500,000 | 1,537,000
Held-to-maturity, Gross Unrealized Losses | (231,000) | (208,000)
Estimated Fair Value | 249,674,000 | $ 125,759,000
Allowance for Credit Losses | $ (48,000) |

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