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Securities (Tables)
 9 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of 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 in the tables below.

There was no allowance for credit losses allocated to any of the Company’s available for sale securities as of September 30, 2023 or December 31, 2022.
 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
September 30, 2023
Obligations of states and political subdivisions$38,200 $71 $(4,732)$33,539 
Residential mortgage backed securities:
Government agency mortgage backed securities321,245 2 (49,799)271,448 
Government agency collateralized mortgage obligations501,793 — (108,896)392,897 
Commercial mortgage backed securities:
Government agency mortgage backed securities6,036 — (908)5,128 
Government agency collateralized mortgage obligations165,812 — (27,071)138,741 
Other debt securities72,386 207 (5,238)67,355 
$1,105,472 $280 $(196,644)$909,108 
 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
December 31, 2022
Obligations of other U.S. Government agencies and corporations$170,000 $— $(5,340)$164,660 
Obligations of states and political subdivisions154,066 204 (9,368)144,902 
Residential mortgage backed securities:
Government agency mortgage backed securities508,415 37 (52,036)456,416 
Government agency collateralized mortgage obligations605,033 — (103,864)501,169 
Commercial mortgage backed securities:
Government agency mortgage backed securities11,166 — (1,053)10,113 
Government agency collateralized mortgage obligations211,435 — (25,589)185,846 
Other debt securities74,885 — (4,049)70,836 
$1,735,000 $241 $(201,299)$1,533,942 
The amortized cost and fair value of securities held to maturity were as follows as of the dates presented:
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
September 30, 2023
Obligations of states and political subdivisions$289,053 $— $(57,660)$231,393 
Residential mortgage backed securities
Government agency mortgage backed securities440,227 — (41,350)398,877 
Government agency collateralized mortgage obligations395,441 — (49,030)346,411 
Commercial mortgage backed securities:
Government agency mortgage backed securities16,989 — (3,800)13,189 
Government agency collateralized mortgage obligations44,725 — (8,235)36,490 
Other debt securities59,192 — (6,429)52,763 
$1,245,627 $— $(166,504)$1,079,123 
Allowance for credit losses - held to maturity securities(32)
Held to maturity securities, net of allowance for credit losses$1,245,595 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
December 31, 2022
Obligations of states and political subdivisions$291,886 $17 $(48,325)$243,578 
Residential mortgage backed securities
Government agency mortgage backed securities483,560 — (24,432)459,128 
Government agency collateralized mortgage obligations423,315 — (30,706)392,609 
Commercial mortgage backed securities:
Government agency mortgage backed securities17,006 — (3,261)13,745 
Government agency collateralized mortgage obligations45,430 — (6,559)38,871 
Other debt securities62,875 — (4,266)58,609 
$1,324,072 $17 $(117,549)$1,206,540 
Allowance for credit losses - held to maturity securities(32)
Held to maturity securities, net of allowance for credit losses$1,324,040 
Schedule of Realized Gain (Loss)
Securities sold were as follows for the nine months ended September 30, 2023. There were no securities sold during the third quarter of 2023 nor the three and nine months ended September 30, 2022.
Carrying ValueNet Proceeds(Loss)
Nine months ended September 30, 2023
Obligations of other U.S. Government agencies and corporations$170,000 $164,915 $(5,085)
Obligations of states and political subdivisions104,950 99,439 (5,511)
Residential mortgage backed securities:
Government agency mortgage backed securities137,196 130,602 (6,594)
Government agency collateralized mortgage obligations54,028 51,101 (2,927)
Commercial mortgage backed securities:
Government agency mortgage backed securities5,048 4,825 (223)
Government agency collateralized mortgage obligations40,197 38,099 (2,098)
$511,419 $488,981 $(22,438)
Schedule of Amortized Cost and Fair Value of Securities by Contractual Maturity
The amortized cost and fair value of securities at September 30, 2023 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.
 
 Held to MaturityAvailable for Sale
 Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due within one year$— $— $6,482 $6,402 
Due after one year through five years3,265 3,044 36,332 36,386 
Due after five years through ten years75,045 62,072 42,481 36,784 
Due after ten years210,743 166,277 16,688 13,887 
Residential mortgage backed securities:
Government agency mortgage backed securities440,227 398,877 321,245 271,448 
Government agency collateralized mortgage obligations395,441 346,411 501,793 392,897 
Commercial mortgage backed securities:
Government agency mortgage backed securities16,989 13,189 6,036 5,128 
Government agency collateralized mortgage obligations44,725 36,490 165,812 138,741 
Other debt securities59,192 52,763 8,603 7,435 
$1,245,627 $1,079,123 $1,105,472 $909,108 
Schedule of Gross Unrealized Losses and Fair Value of Available-for-Sale Securities
The following tables present 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:
September 30, 2023
Obligations of states and political subdivisions65,196 (27)1623,814 (4,705)2229,010 (4,732)
Residential mortgage backed securities:
Government agency mortgage backed securities— — — 53267,412 (49,799)53267,412 (49,799)
Government agency collateralized mortgage obligations— — — 41392,897 (108,896)41392,897 (108,896)
Commercial mortgage backed securities:
Government agency mortgage backed securities—— — 25,128 (908)25,128 (908)
Government agency collateralized mortgage obligations—— — 28138,742 (27,071)28138,742 (27,071)
Other debt securities1957 (53)2036,456 (5,185)2137,413 (5,238)
Total7$6,153 $(80)160$864,449 $(196,564)167$870,602 $(196,644)
December 31, 2022
Obligations of other U.S. Government agencies and corporations5$164,660 $(5,340)—$— $— 5$164,660 $(5,340)
Obligations of states and political subdivisions84$96,939 $(4,869)11$33,038 $(4,499)95$129,977 $(9,368)
Residential mortgage backed securities:
Government agency mortgage backed securities97214,516 (15,115)29237,970 (36,921)126452,486 (52,036)
Government agency collateralized mortgage obligations16109,753 (8,552)36391,416 (95,312)52501,169 (103,864)
Commercial mortgage backed securities:
Government agency mortgage backed securities410,114 (1,053)—— — 410,114 (1,053)
Government agency collateralized mortgage obligations1667,026 (3,829)21118,821 (21,760)37185,847 (25,589)
Other debt securities2563,423 (3,166)17,412 (883)2670,835 (4,049)
Total247$726,431 $(41,924)98$788,657 $(159,375)345$1,515,088 $(201,299)
Schedule of Gross Unrealized Losses and Fair Value of Held-to-Maturity Securities
 Less than 12 Months12 Months or MoreTotal
 #Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses
Held to Maturity:
September 30, 2023
Obligations of states and political subdivisions—$— $— 129$231,393 $(57,660)129$231,393 $(57,660)
Residential mortgage backed securities:
Government agency mortgage backed securities—— — 70398,876 (41,350)70398,876 (41,350)
Government agency collateralized mortgage obligations—— — 18346,411 (49,030)18346,411 (49,030)
Commercial mortgage backed securities:
Government agency mortgage backed securities—— — 113,189 (3,800)113,189 (3,800)
Government agency collateralized mortgage obligations—— — 936,490 (8,235)936,490 (8,235)
Other debt securities—— — 1052,761 (6,429)1052,761 (6,429)
Total—$— $— 237$1,079,120 $(166,504)237$1,079,120 $(166,504)
December 31, 2022
Obligations of states and political subdivisions105$191,442 $(35,871)24$49,697 $(12,454)129$241,139 $(48,325)
Residential mortgage backed securities:
Government agency mortgage backed securities894,258 (4,186)62364,870 (20,246)70459,128 (24,432)
Government agency collateralized mortgage obligations498,912 (5,479)14293,698 (25,227)18392,610 (30,706)
Commercial mortgage backed securities:
Government agency mortgage backed securities113,745 (3,261)—— — 113,745 (3,261)
Government agency collateralized mortgage obligations27,651 (626)731,220 (5,933)938,871 (6,559)
Other debt securities242,567 (2,013)816,042 (2,253)1058,609 (4,266)
Total122$448,575 $(51,436)115$755,527 $(66,113)237$1,204,102 $(117,549)