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Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Amortized cost and fair value of securities available for sale | The amortized cost and fair value of securities available for sale were as follows as of the dates presented:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
December 31, 2020 |  |  |  |  |  |  |
U.S. Treasury securities | $ | 7,047 |  |  | $ | 32 |  |  | $ | — |  |  | $ | 7,079 |
Obligations of other U.S. Government agencies and corporations | 1,003 |  |  | 6 |  |  | — |  |  | 1,009 |
Obligations of states and political subdivisions | 291,231 |  |  | 14,015 |  |  | (45) |  |  | 305,201 |
Residential mortgage backed securities: |  |  |  |  |  |  |
Government agency mortgage backed securities | 581,105 |  |  | 21,564 |  |  | (23) |  |  | 602,646 |
Government agency collateralized mortgage obligations | 218,373 |  |  | 1,946 |  |  | (51) |  |  | 220,268 |
Commercial mortgage backed securities: |  |  |  |  |  |  |
Government agency mortgage backed securities | 29,053 |  |  | 1,235 |  |  | (1) |  |  | 30,287 |
Government agency collateralized mortgage obligations | 99,377 |  |  | 2,992 |  |  | (21) |  |  | 102,348 |
Trust preferred securities | 12,013 |  |  | — |  |  | (3,001) |  |  | 9,012 |
Other debt securities | 62,771 |  |  | 2,909 |  |  | (73) |  |  | 65,607 |
| $ | 1,301,973 |  |  | $ | 44,699 |  |  | $ | (3,215) |  |  | $ | 1,343,457 |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
December 31, 2019 |  |  |  |  |  |  |
U.S. Treasury securities | $ | 498 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 499 |
Obligations of other U.S. Government agencies and corporations | 2,518 |  |  | 16 |  |  | (3) |  |  | 2,531 |
Obligations of states and political subdivisions | 218,362 |  |  | 5,134 |  |  | (365) |  |  | 223,131 |
Residential mortgage backed securities: |  |  |  |  |  |  |
Government agency mortgage backed securities | 708,970 |  |  | 8,951 |  |  | (1,816) |  |  | 716,105 |
Government agency collateralized mortgage obligations | 172,178 |  |  | 1,322 |  |  | (262) |  |  | 173,238 |
Commercial mortgage backed securities: |  |  |  |  |  |  |
Government agency mortgage backed securities | 30,372 |  |  | 659 |  |  | (24) |  |  | 31,007 |
Government agency collateralized mortgage obligations | 76,456 |  |  | 1,404 |  |  | (109) |  |  | 77,751 |
Trust preferred securities | 12,153 |  |  | — |  |  | (2,167) |  |  | 9,986 |
Other debt securities | 55,364 |  |  | 1,133 |  |  | (132) |  |  | 56,365 |
| $ | 1,276,871 |  |  | $ | 18,620 |  |  | $ | (4,878) |  |  | $ | 1,290,613 |
Gross realized gains and gross realized losses on sales of securities available for sale | Securities sold were as follows for the periods presented:
| Carrying Value |  | Net Proceeds |  | Gain/(Loss)
Twelve months ended December 31, 2020 |  |  |  |  |
Obligations of states and political subdivisions | $ | 2,696 |  |  | $ | 2,561 |  |  | $ | (135) |
Residential mortgage backed securities: |  |  |  |  |
Government agency mortgage backed securities | 16,093 |  |  | 16,294 |  |  | 201 |
Government agency collateralized mortgage obligations | 26,071 |  |  | 26,051 |  |  | (20) |
| $ | 44,860 |  |  | $ | 44,906 |  |  | $ | 46 |
| Carrying Value |  | Net Proceeds |  | Gain/(Loss)
Twelve months ended December 31, 2019 |  |  |  |  |
Obligations of states and political subdivisions | $ | 11,799 |  |  | $ | 11,813 |  |  | $ | 14 |
Residential mortgage backed securities: |  |  |  |  |
Government agency mortgage backed securities | 72,556 |  |  | 71,944 |  |  | (612) |
Government agency collateralized mortgage obligations | 122,692 |  |  | 120,892 |  |  | (1,800) |
Commercial mortgage backed securities: |  |  |  |  |
Government agency collateralized mortgage obligations | 4,838 |  |  | 4,720 |  |  | (118) |
Other debt securities | 252 |  |  | 257 |  |  | 5 |
Other equity securities | — |  |  | 2,859 |  |  | 2,859 |
| $ | 212,137 |  |  | $ | 212,485 |  |  | $ | 348 |
| Carrying Value |  | Net Proceeds |  | Loss
Twelve months ended December 31, 2018 |  |  |  |  |
Obligations of states and political subdivisions | $ | 901 |  |  | $ | 893 |  |  | $ | (8) |
Residential mortgage backed securities: |  |  |  |  |
Government agency mortgage backed securities | 943 |  |  | 942 |  |  | (1) |
Government agency collateralized mortgage obligations | 559 |  |  | 552 |  |  | (7) |
| $ | 2,403 |  |  | $ | 2,387 |  |  | $ | (16) |
Gross realized gains and gross realized losses on sales of securities available for sale were as follows for the periods presented:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Gross gains on sales of securities available for sale | $ | 230 |  |  | $ | 2,979 |  |  | $ | 11 |
Gross losses on sales of securities available for sale | (184) |  |  | (2,631) |  |  | (27) |
Gain (losses) on sales of securities available for sale, net | $ | 46 |  |  | $ | 348 |  |  | $ | (16) |
Amortized cost and fair value of securities by contractual maturity | The amortized cost and fair value of securities at December 31, 2020 by contractual maturity are shown below. Expected maturities will differ from contractual maturities because issuers may call or prepay obligations with or without call or prepayment penalties.
|  |  | Available for Sale
|  |  |  |  | Amortized Cost |  | Fair Value
Due within one year |  |  |  |  | $ | 9,438 |  |  | $ | 9,520 |
Due after one year through five years |  |  |  |  | 45,943 |  |  | 48,017 |
Due after five years through ten years |  |  |  |  | 74,337 |  |  | 78,271 |
Due after ten years |  |  |  |  | 215,924 |  |  | 221,836 |
Residential mortgage backed securities: |  |  |  |  |  |  |
Government agency mortgage backed securities |  |  |  |  | 581,105 |  |  | 602,646 |
Government agency collateralized mortgage obligations |  |  |  |  | 218,373 |  |  | 220,268 |
Commercial mortgage backed securities: |  |  |  |  |  |  |
Government agency mortgage backed securities |  |  |  |  | 29,053 |  |  | 30,287 |
Government agency collateralized mortgage obligations |  |  |  |  | 99,377 |  |  | 102,348 |
Other debt securities |  |  |  |  | 28,423 |  |  | 30,264 |
|  |  |  |  | $ | 1,301,973 |  |  | $ | 1,343,457 |
Unrealized losses and fair value by investment category | The following table presents the gross unrealized losses and fair value of investment securities, aggregated by investment category and the length of time the investments have been in a continuous unrealized loss position, as of the dates presented:
| Less than 12 Months |  | 12 Months or More |  | Total
| # |  | Fair Value |  | Unrealized Losses |  | # |  | Fair Value |  | Unrealized Losses |  | # |  | Fair Value |  | Unrealized Losses
Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | 6 |  | $ | 9,403 |  |  | $ | (45) |  |  | — |  | $ | — |  |  | $ | — |  |  | 6 |  | $ | 9,403 |  |  | $ | (45) |
Residential mortgage backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency mortgage backed securities | 2 |  | 19,755 |  |  | (23) |  |  | — |  | — |  |  | — |  |  | 2 |  | 19,755 |  |  | (23) |
Government agency collateralized mortgage obligations | 5 |  | 27,143 |  |  | (51) |  |  | — |  | — |  |  | — |  |  | 5 |  | 27,143 |  |  | (51) |
Commercial mortgage backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency mortgage backed securities | 1 |  | 1,538 |  |  | (1) |  |  | 1 |  | 459 |  |  | — |  |  | 2 |  | 1,997 |  |  | (1) |
Government agency collateralized mortgage obligations | 3 |  | 14,190 |  |  | (21) |  |  | — |  | — |  |  | — |  |  | 3 |  | 14,190 |  |  | (21) |
Trust preferred securities | — |  | — |  |  | — |  |  | 2 |  | 9,012 |  |  | (3,001) |  |  | 2 |  | 9,012 |  |  | (3,001) |
Other debt securities | 4 |  | 3,330 |  |  | (70) |  |  | 1 |  | 566 |  |  | (3) |  |  | 5 |  | 3,896 |  |  | (73) |
Total | 21 |  | $ | 75,359 |  |  | $ | (211) |  |  | 4 |  | $ | 10,037 |  |  | $ | (3,004) |  |  | 25 |  | $ | 85,396 |  |  | $ | (3,215) |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of other U.S. Government agencies and corporations | — |  | $ | — |  |  | $ | — |  |  | 1 |  | $ | 1,008 |  |  | $ | (3) |  |  | 1 |  | $ | 1,008 |  |  | $ | (3) |
Obligations of states and political subdivisions | 26 |  | 33,902 |  |  | (365) |  |  | — |  | — |  |  | — |  |  | 26 |  | 33,902 |  |  | (365) |
Residential mortgage backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency mortgage backed securities | 37 |  | 233,179 |  |  | (1,504) |  |  | 16 |  | 20,775 |  |  | (312) |  |  | 53 |  | 253,954 |  |  | (1,816) |
Government agency collateralized mortgage obligations | 11 |  | 45,319 |  |  | (262) |  |  | — |  | — |  |  | — |  |  | 11 |  | 45,319 |  |  | (262) |
Commercial mortgage backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency mortgage backed securities | 1 |  | 4,976 |  |  | (23) |  |  | 2 |  | 1,190 |  |  | (1) |  |  | 3 |  | 6,166 |  |  | (24) |
Government agency collateralized mortgage obligations | 1 |  | 4,910 |  |  | (109) |  |  | — |  | — |  |  | — |  |  | 1 |  | 4,910 |  |  | (109) |
Trust preferred securities | — |  | — |  |  | — |  |  | 2 |  | 9,986 |  |  | (2,167) |  |  | 2 |  | 9,986 |  |  | (2,167) |
Other debt securities | 3 |  | 8,737 |  |  | (131) |  |  | 1 |  | 741 |  |  | (1) |  |  | 4 |  | 9,478 |  |  | (132) |
Total | 79 |  | $ | 331,023 |  |  | $ | (2,394) |  |  | 22 |  | $ | 33,700 |  |  | $ | (2,484) |  |  | 101 |  | $ | 364,723 |  |  | $ | (4,878) |

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