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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost of Securities and Fair Values
The following tables summarize the amortized cost, allowance for credit losses and fair value of the available-for-sale debt securities and the corresponding amounts of unrealized gains and losses recognized in accumulated other comprehensive loss at September 30, 2023 and December 31, 2022:  
September 30, 2023
 Amortized cost Gross unrealized gains Gross unrealized losses Allowance for credit losses for investments Fair Value
Investment Securities    
Available-for-sale debt securities  
U.S. government agency securities$107,300 $112 $(1,611)$— $105,801 
Mortgage-backed securities - residential1,083,311 — (212,237)— 871,074 
Mortgage-backed securities - commercial 18,517 — (1,840)— 16,677 
Municipal securities289,009 67 (44,465)— 244,611 
U.S. Treasury securities111,630 — (4,832)— 106,798 
Corporate securities3,500 — (242)— 3,258 
Total$1,613,267 $179 $(265,227)$— $1,348,219 
December 31, 2022
 Amortized costGross unrealized gains Gross unrealized losses Allowance for credit losses for investmentsFair Value
Investment Securities    
Available-for-sale debt securities    
U.S. government agency securities$45,167 $— $(5,105)$— $40,062 
Mortgage-backed securities - residential1,224,522 — (190,329)— 1,034,193 
Mortgage-backed securities - commercial19,209 — (1,565)— 17,644 
Municipal securities295,375 458 (31,413)— 264,420 
U.S. Treasury securities113,301 — (5,621)— 107,680 
Corporate securities8,000 — (813)— 7,187 
Total$1,705,574 $458 $(234,846)$— $1,471,186 
Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity Therefore, mortgage-backed securities are not included in the maturity categories in the following summary.
September 30,December 31,
 2023 2022 
 Available-for-saleAvailable-for-sale
 Amortized costFair valueAmortized costFair value
Due in one year or less$64,611 $63,615 $4,277 $4,225 
Due in one to five years80,999 74,854 161,556 152,181 
Due in five to ten years60,133 56,477 61,290 57,859 
Due in over ten years305,696 265,522 234,720 205,084 
511,439 460,468 461,843 419,349 
Mortgage-backed securities - residential1,083,311 871,074 1,224,522 1,034,193 
Mortgage-backed securities - commercial18,517 16,677 19,209 17,644 
Total debt securities$1,613,267 $1,348,219 $1,705,574 $1,471,186 
Schedule of Sales and Other Dispositions of Available-for-Sale Securities
Sales and other dispositions of available-for-sale securities were as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
 2023 2022 2023 2022 
Proceeds from sales$75,857 $— $75,857 $1,218 
Proceeds from maturities, prepayments and calls32,946 44,352 91,361 170,701 
Gross realized gains19 1 19 4 
Gross realized losses14,119 — 14,119 — 
Schedule of Gross Unrealized Losses
The following tables show gross unrealized losses for which an allowance for credit losses has not been recorded at September 30, 2023 and December 31, 2022, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
September 30, 2023
 Less than 12 months12 months or moreTotal
 Fair ValueGross Unrealized Loss Fair ValueGross Unrealized LossFair ValueGross Unrealized Loss
U.S. government agency securities$16,401 $(23)$13,606 $(1,588)$30,007 $(1,611)
Mortgage-backed securities - residential— — 871,074 (212,237)871,074 (212,237)
Mortgage-backed securities - commercial— — 16,677 (1,840)16,677 (1,840)
Municipal securities69,271 (2,892)173,513 (41,573)242,784 (44,465)
U.S. Treasury securities— — 106,798 (4,832)106,798 (4,832)
Corporate securities— — 3,258 (242)3,258 (242)
Total$85,672 $(2,915)$1,184,926 $(262,312)$1,270,598 $(265,227)
 December 31, 2022
 Less than 12 months12 months or moreTotal
 Fair ValueGross Unrealized LossFair ValueGross Unrealized LossFair ValueGross Unrealized Loss
U.S. government agency securities$23,791 $(2,802)$16,271 $(2,303)$40,062 $(5,105)
Mortgage-backed securities - residential316,656 (32,470)717,537 (157,859)1,034,193 (190,329)
Mortgage-backed securities - commercial11,104 (968)6,540 (597)17,644 (1,565)
Municipal securities196,419 (26,811)36,726 (4,602)233,145 (31,413)
U.S. Treasury securities94,248 (4,122)13,432 (1,499)107,680 (5,621)
Corporate securities4,008 (492)3,179 (321)7,187 (813)
Total$646,226 $(67,665)$793,685 $(167,181)$1,439,911 $(234,846)