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Securities (Tables)
 12 Months Ended
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 corporations1,003 6 — 1,009 
Obligations of states and political subdivisions291,231 14,015 (45)305,201 
Residential mortgage backed securities:
Government agency mortgage backed securities581,105 21,564 (23)602,646 
Government agency collateralized mortgage obligations218,373 1,946 (51)220,268 
Commercial mortgage backed securities:
Government agency mortgage backed securities29,053 1,235 (1)30,287 
Government agency collateralized mortgage obligations99,377 2,992 (21)102,348 
Trust preferred securities12,013 — (3,001)9,012 
Other debt securities62,771 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 corporations2,518 16 (3)2,531 
Obligations of states and political subdivisions218,362 5,134 (365)223,131 
Residential mortgage backed securities:
Government agency mortgage backed securities708,970 8,951 (1,816)716,105 
Government agency collateralized mortgage obligations172,178 1,322 (262)173,238 
Commercial mortgage backed securities:
Government agency mortgage backed securities30,372 659 (24)31,007 
Government agency collateralized mortgage obligations76,456 1,404 (109)77,751 
Trust preferred securities12,153 — (2,167)9,986 
Other debt securities55,364 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 ValueNet ProceedsGain/(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 securities16,093 16,294 201 
Government agency collateralized mortgage obligations26,071 26,051 (20)
$44,860 $44,906 $46 

Carrying ValueNet ProceedsGain/(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 securities72,556 71,944 (612)
Government agency collateralized mortgage obligations122,692 120,892 (1,800)
Commercial mortgage backed securities:
Government agency collateralized mortgage obligations4,838 4,720 (118)
Other debt securities252 257 5 
Other equity securities— 2,859 2,859 
$212,137 $212,485 $348 

Carrying ValueNet ProceedsLoss
Twelve months ended December 31, 2018
Obligations of states and political subdivisions$901 $893 $(8)
Residential mortgage backed securities:
Government agency mortgage backed securities943 942 (1)
Government agency collateralized mortgage obligations559 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,
 202020192018
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 years45,943 48,017 
Due after five years through ten years74,337 78,271 
Due after ten years215,924 221,836 
Residential mortgage backed securities:
Government agency mortgage backed securities581,105 602,646 
Government agency collateralized mortgage obligations218,373 220,268 
Commercial mortgage backed securities:
Government agency mortgage backed securities29,053 30,287 
Government agency collateralized mortgage obligations99,377 102,348 
Other debt securities28,423 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 Months12 Months or MoreTotal
 #Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses
Available for Sale:
December 31, 2020
Obligations of states and political subdivisions6$9,403 $(45)—$— $— 6$9,403 $(45)
Residential mortgage backed securities:
Government agency mortgage backed securities219,755 (23)—— — 219,755 (23)
Government agency collateralized mortgage obligations527,143 (51)—— — 527,143 (51)
Commercial mortgage backed securities:
Government agency mortgage backed securities11,538 (1)1459 — 21,997 (1)
Government agency collateralized mortgage obligations314,190 (21)—— — 314,190 (21)
Trust preferred securities—— — 29,012 (3,001)29,012 (3,001)
Other debt securities43,330 (70)1566 (3)53,896 (73)
Total21$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 subdivisions2633,902 (365)—— — 2633,902 (365)
Residential mortgage backed securities:
Government agency mortgage backed securities37233,179 (1,504)1620,775 (312)53253,954 (1,816)
Government agency collateralized mortgage obligations1145,319 (262)—— — 1145,319 (262)
Commercial mortgage backed securities:
Government agency mortgage backed securities14,976 (23)21,190 (1)36,166 (24)
Government agency collateralized mortgage obligations14,910 (109)—— — 14,910 (109)
Trust preferred securities—— — 29,986 (2,167)29,986 (2,167)
Other debt securities38,737 (131)1741 (1)49,478 (132)
Total79$331,023 $(2,394)22$33,700 $(2,484)101$364,723 $(4,878)