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Securities (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Amortized cost and fair value of securities available for sale
The amortized cost, fair value and allowance for credit losses of securities available for sale were as follows as of the dates presented:
 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair
Value
June 30, 2020
U.S. Treasury securities$7,586  $53  $—  $—  $7,639  
Obligations of other U.S. Government agencies and corporations2,509  21  —  —  2,530  
Obligations of states and political subdivisions263,618  10,170  (817) —  272,971  
Residential mortgage backed securities:
Government agency mortgage backed securities659,279  24,887  (1) —  684,165  
Government agency collateralized mortgage obligations137,181  2,366  (27) —  139,520  
Commercial mortgage backed securities:
Government agency mortgage backed securities32,706  1,712  (1) —  34,417  
Government agency collateralized mortgage obligations90,309  3,434  (40) —  93,703  
Trust preferred securities12,068  —  (4,389) —  7,679  
Other debt securities58,642  2,440  (212) —  60,870  
$1,263,898  $45,083  $(5,487) $—  $1,303,494  
 
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  
Schedule of realized gain (loss)
Securities sold were as follows for the periods presented:
Carrying ValueNet ProceedsGain/(Loss)
Three months ended June 30, 2020
Obligations of states and political subdivisions$2,696  $2,561  $(135) 
Residential mortgage backed securities:
Government agency mortgage backed securities6,046  6,212  166  
$8,742  $8,773  $31  
Six months ended June 30, 2020
Obligations of states and political subdivisions$2,696  $2,561  $(135) 
Residential mortgage backed securities:
Government agency mortgage backed securities6,046  6,212  166  
$8,742  $8,773  $31  
Carrying ValueNet ProceedsGain/(Loss)
Three months ended June 30, 2019
Obligations of states and political subdivisions$320  $319  $(1) 
Residential mortgage backed securities:
Government agency mortgage backed securities1,400  1,396  (4) 
Government agency collateralized mortgage obligations289  286  (3) 
$2,009  $2,001  $(8) 
Six months ended June 30, 2019
Obligations of states and political subdivisions$10,688  $10,703  $15  
Residential mortgage backed securities:
Government agency mortgage backed securities1,630  1,623  (7) 
Government agency collateralized mortgage obligations289  286  (3) 
$12,607  $12,612  $5  

Gross realized gains and losses on sales of securities available for sale for the three and six months ended June 30, 2020 and 2019 were as follows:
Three Months EndedSix Months Ended
 June 30,June 30,
 2020201920202019
Gross gains on sales of securities available for sale$166  $1  $166  $46  
Gross losses on sales of securities available for sale(135) (9) (135) (41) 
Gains (losses) on sales of securities available for sale, net$31  $(8) $31  $5  
Amortized cost and fair value of securities by contractual maturity
The amortized cost and fair value of securities at June 30, 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$14,851  $14,938  
Due after one year through five years38,030  39,616  
Due after five years through ten years78,289  81,913  
Due after ten years175,427  175,207  
Residential mortgage backed securities:
Government agency mortgage backed securities659,279  684,165  
Government agency collateralized mortgage obligations137,181  139,520  
Commercial mortgage backed securities:
Government agency mortgage backed securities32,706  34,417  
Government agency collateralized mortgage obligations90,309  93,703  
Other debt securities37,826  40,015  
$1,263,898  $1,303,494  
Gross unrealized losses and fair value by investment category
The following table presents the age of gross unrealized losses and fair value by investment category for which an allowance for credit losses has not been recorded 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:
June 30, 2020
Obligations of states and political subdivisions24$40,387  $(817) 0$—  $—  24$40,387  $(817) 
Residential mortgage backed securities:
Government agency mortgage backed securities2828  (1) 0—  —  2828  (1) 
Government agency collateralized mortgage obligations413,916  (27) 0—  —  413,916  (27) 
Commercial mortgage backed securities:
Government agency mortgage backed securities0—  —  21,162  (1) 21,162  (1) 
Government agency collateralized mortgage obligations14,708  (40) 0—  —  14,708  (40) 
Trust preferred securities0—  —  27,679  (4,389) 27,679  (4,389) 
Other debt securities129,899  (212) 0—  —  129,899  (212) 
Total43$69,738  $(1,097) 4$8,841  $(4,390) 47$78,579  $(5,487) 
December 31, 2019
Obligations of other U.S. Government agencies and corporations0$—  $—  1$1,008  $(3) 1$1,008  $(3) 
Obligations of states and political subdivisions2633,902  (365) 0—  —  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) 0—  —  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) 0—  —  14,910  (109) 
Trust preferred securities0—  —  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)