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Securities (Tables) | 9 Months Ended
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Sep. 30, 2020
Investments Debt And Equity Securities [Abstract] |
Summary of Amortized Cost and Fair Values of Securities Available-for-sale, and Held to Maturity | The following tables summarize the amortized cost and fair values of securities available-for-sale and securities held-to-maturity as of the dates shown and the corresponding amounts of gross unrealized gains and losses:
September 30, 2020 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Notes |  | $ | 25,456 |  |  | $ | 495 |  |  | $ | — |  |  | $ | 25,951 |
U.S. Government agencies |  |  | 104,253 |  |  |  | 814 |  |  |  | (357 | ) |  |  | 104,710 |
Obligations of states, municipalities, and political subdivisions |  |  | 103,895 |  |  |  | 4,417 |  |  |  | — |  |  |  | 108,312 |
Residential mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  |  | 807,798 |  |  |  | 16,594 |  |  |  | (355 | ) |  |  | 824,037 |
Non-agency |  |  | 62,775 |  |  |  | 1,321 |  |  |  | — |  |  |  | 64,096 |
Commercial mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  |  | 256,830 |  |  |  | 7,415 |  |  |  | (513 | ) |  |  | 263,732 |
Non-agency |  |  | 11,215 |  |  |  | 428 |  |  |  | — |  |  |  | 11,643 |
Corporate securities |  |  | 56,059 |  |  |  | 1,364 |  |  |  | (215 | ) |  |  | 57,208 |
Asset-backed securities |  |  | 50,354 |  |  |  | 89 |  |  |  | (921 | ) |  |  | 49,522 |
Total |  | $ | 1,478,635 |  |  | $ | 32,937 |  |  | $ | (2,361 | ) |  | $ | 1,509,211 |
September 30, 2020 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states, municipalities, and political subdivisions |  | $ | 4,400 |  |  | $ | 189 |  |  | $ | — |  |  | $ | 4,589 |
Total |  | $ | 4,400 |  |  | $ | 189 |  |  | $ | — |  |  | $ | 4,589 |
December 31, 2019 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Notes |  | $ | 41,403 |  |  | $ | 427 |  |  | $ | — |  |  | $ | 41,830 |
U.S. Government agencies |  |  | 165,162 |  |  |  | 542 |  |  |  | (754 | ) |  |  | 164,950 |
Obligations of states, municipalities, and political subdivisions |  |  | 92,806 |  |  |  | 2,075 |  |  |  | (49 | ) |  |  | 94,832 |
Residential mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  |  | 490,427 |  |  |  | 2,163 |  |  |  | (2,354 | ) |  |  | 490,236 |
Non-agency |  |  | 109,501 |  |  |  | 593 |  |  |  | (272 | ) |  |  | 109,822 |
Commercial mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  |  | 159,650 |  |  |  | 1,092 |  |  |  | (1,041 | ) |  |  | 159,701 |
Non-agency |  |  | 31,144 |  |  |  | 130 |  |  |  | — |  |  |  | 31,274 |
Corporate securities |  |  | 48,796 |  |  |  | 571 |  |  |  | (37 | ) |  |  | 49,330 |
Asset-backed securities |  |  | 44,515 |  |  |  | — |  |  |  | (198 | ) |  |  | 44,317 |
Total |  | $ | 1,183,404 |  |  | $ | 7,593 |  |  | $ | (4,705 | ) |  | $ | 1,186,292 |
December 31, 2019 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states, municipalities, and political subdivisions |  | $ | 4,412 |  |  | $ | 86 |  |  | $ | — |  |  | $ | 4,498 |
Total |  | $ | 4,412 |  |  | $ | 86 |  |  | $ | — |  |  | $ | 4,498 |
Summary of Gross Unrealized Losses and Fair Values, Aggregated by Investment Category and Length of Individual Securities Continuous Unrealized Loss Position Available-for-sale and Held to Maturity | Gross unrealized losses and fair values, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of September 30, 2020 and December 31, 2019, are summarized as follows:
|  |  |  |  |  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |  |
September 30, 2020 |  | # of Securities |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 7 |  |  | $ | 50,779 |  |  | $ | (357 | ) |  | $ | — |  |  | $ | — |  |  | $ | 50,779 |  |  | $ | (357 | )
Obligations of states, municipalities and political subdivisions |  |  | 1 |  |  |  | 126 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 126 |  |  |  | — |
Residential mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  |  | 11 |  |  |  | 116,877 |  |  |  | (349 | ) |  |  | 503 |  |  |  | (6 | ) |  |  | 117,380 |  |  |  | (355 | )
Commercial mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  |  | 7 |  |  |  | 59,474 |  |  |  | (513 | ) |  |  | — |  |  |  | — |  |  |  | 59,474 |  |  |  | (513 | )
Corporate securities |  |  | 7 |  |  |  | 12,304 |  |  |  | (215 | ) |  |  | — |  |  |  | — |  |  |  | 12,304 |  |  |  | (215 | )
Asset-backed securities |  |  | 8 |  |  |  | 19,239 |  |  |  | (301 | ) |  |  | 19,200 |  |  |  | (620 | ) |  |  | 38,439 |  |  |  | (921 | )
Total |  |  | 41 |  |  | $ | 258,799 |  |  | $ | (1,735 | ) |  | $ | 19,703 |  |  | $ | (626 | ) |  | $ | 278,502 |  |  | $ | (2,361 | )
|  |  |  |  |  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
December 31, 2019 |  | # of Securities |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 8 |  |  | $ | 49,318 |  |  | $ | (662 | ) |  | $ | 20,283 |  |  | $ | (92 | ) |  | $ | 69,601 |  |  | $ | (754 | )
Obligations of states, municipalities and political subdivisions |  |  | 7 |  |  |  | 13,309 |  |  |  | (45 | ) |  |  | 1,419 |  |  |  | (4 | ) |  |  | 14,728 |  |  |  | (49 | )
Residential mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  |  | 50 |  |  |  | 132,703 |  |  |  | (666 | ) |  |  | 193,363 |  |  |  | (1,688 | ) |  |  | 326,066 |  |  |  | (2,354 | )
Non-agency |  |  | 9 |  |  |  | 36,902 |  |  |  | (206 | ) |  |  | 10,126 |  |  |  | (66 | ) |  |  | 47,028 |  |  |  | (272 | )
Commercial mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  |  | 13 |  |  |  | 67,649 |  |  |  | (563 | ) |  |  | 32,678 |  |  |  | (478 | ) |  |  | 100,327 |  |  |  | (1,041 | )
Corporate securities |  |  | 4 |  |  |  | 6,103 |  |  |  | (37 | ) |  |  | — |  |  |  | — |  |  |  | 6,103 |  |  |  | (37 | )
Asset-backed securities |  |  | 8 |  |  |  | 37,738 |  |  |  | (198 | ) |  |  | — |  |  |  | — |  |  |  | 37,738 |  |  |  | (198 | )
Total |  |  | 99 |  |  | $ | 343,722 |  |  | $ | (2,377 | ) |  | $ | 257,869 |  |  | $ | (2,328 | ) |  | $ | 601,591 |  |  | $ | (4,705 | )
Summary of Proceeds From Sales of Securities Available-for-sale and Associated Gains and Losses | The proceeds from all sales of securities available-for-sale, and the associated gains and losses, for the three and nine months ended September 30, 2020 and 2019 are listed below:
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Proceeds |  | $ | 35,092 |  |  | $ | 32,509 |  |  | $ | 80,509 |  |  | $ | 92,103 |
Gross gains |  |  | 1,037 |  |  |  | 225 |  |  |  | 2,494 |  |  |  | 1,274 |
Gross losses |  |  | — |  |  |  | 47 |  |  |  | 82 |  |  |  | 123 |
Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity | At September 30, 2020, the amortized cost and fair value of debt securities are shown by contractual maturity. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.
|  | Amortized Cost |  |  | Fair Value |
Available-for-sale |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 26,009 |  |  | $ | 26,278 |
Due from one to five years |  |  | 46,331 |  |  |  | 48,014 |
Due from five to ten years |  |  | 163,361 |  |  |  | 166,150 |
Due after ten years |  |  | 104,316 |  |  |  | 105,261 |
Mortgage-backed securities |  |  | 1,138,618 |  |  |  | 1,163,508 |
Total |  | $ | 1,478,635 |  |  | $ | 1,509,211 |
Held-to-maturity |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 502 |  |  | $ | 505 |
Due from one to five years |  |  | 3,898 |  |  |  | 4,084 |
Total |  | $ | 4,400 |  |  | $ | 4,589 |

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