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Securities (Tables)
 12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Debt Securities, Available-for-sale The amortized cost and fair value of securities available-for-sale and held-to-maturity at December 31, 2022 and 2021 are summarized as follows (in thousands):
Amortized CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
December 31, 2022
Securities available-for-sale:    
U.S Treasury securities$196,151 $— $1,967 $194,184 
U.S. Government agency securities432,475 — 36,318 396,157 
Mortgage-backed securities1,114,948 211 143,583 971,576 
State and municipal securities1,478,310 12,553 78,557 1,412,306 
Asset-backed securities134,386 — 16,983 117,403 
Corporate notes and other515,221 41 48,018 467,244 
 $3,871,491 $12,805 $325,426 $3,558,870 
Securities held-to-maturity:    
U.S Treasury securities$92,738 $— $6,472 $86,266 
U.S. Government agency securities374,255 — 27,860 346,395 
Mortgage-backed securities413,119 52 41,593 371,578 
State and municipal securities1,927,778 2,216 233,564 1,696,430 
Asset-backed securities184,241 — 18,573 165,668 
Corporate notes and other88,527 — 9,918 78,609 
 $3,080,658 $2,268 $337,980 $2,744,946 
Allowance for credit losses - securities held-to-maturity(1,608)
Securities held-to-maturity, net of allowance for credit losses$3,079,050 
December 31, 2021    
Securities available-for-sale:    
U.S Treasury securities$194,490 $— $881 $193,609 
U.S. Government agency securities634,611 2,359 4,961 632,009 
Mortgage-backed securities1,908,675 29,874 18,310 1,920,239 
State and municipal securities1,774,119 52,961 3,243 1,823,837 
Asset-backed securities232,294 60 2,785 229,569 
Corporate notes and other114,355 3,082 2,506 114,931 
 $4,858,544 $88,336 $32,686 $4,914,194 
Securities held-to-maturity:    
U.S. Government agency securities11,920 — 37 11,883 
Mortgage-backed securities106,555 86 196 106,445 
State and municipal securities1,037,644 32,966 889 1,069,721 
 $1,156,119 $33,052 $1,122 $1,188,049 
Allowance for credit losses - securities held-to-maturity(161)
Securities held-to-maturity, net of allowance for credit losses$1,155,958 
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity The amortized cost and fair value of debt securities as of December 31, 2022 by contractual maturity is shown below. Actual maturities may differ from contractual maturities of mortgage-backed securities since the mortgages underlying the securities may be called or prepaid with or without penalty. Therefore, these securities are not included in the maturity categories in the following summary (in thousands):
 Available-for-saleHeld-to-maturity
 Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$12,329 $12,234 $1,994 $1,981 
Due in one year to five years186,874 193,512 427,894 396,683 
Due in five years to ten years725,776 654,799 133,681 120,245 
Due after ten years1,697,178 1,609,346 1,919,729 1,688,791 
Mortgage-backed securities1,114,948 971,576 413,119 371,578 
Asset-backed securities134,386 117,403 184,241 165,668 
 $3,871,491 $3,558,870 $3,080,658 $2,744,946 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value At December 31, 2022 and 2021, included in securities available-for-sale were the following investments with unrealized losses. The information below classifies these investments according to the term of the unrealized loss of less than twelve months or twelve months or longer (in thousands):
 Investments with an Unrealized Loss of
less than 12 months		Investments with an
Unrealized Loss of
12 months or longer		Total Investments
with an
Unrealized Loss
 Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized
Losses
December 31, 2022      
U.S. Treasury securities$192,188 $1,963 $1,997 $4 $194,185 $1,967 
U.S. Government agency securities46,062 2,224 350,094 34,094 396,156 36,318 
Mortgage-backed securities390,014 34,106 570,601 109,477 960,615 143,583 
State and municipal securities568,691 18,863 304,451 59,694 873,142 78,557 
Asset-backed securities513 5 116,442 16,978 116,955 16,983 
Corporate notes and other259,453 20,260 207,326 27,758 466,779 48,018 
Total temporarily-impaired securities$1,456,921 $77,421 $1,550,911 $248,005 $3,007,832 $325,426 
December 31, 2021      
U.S. Treasury securities$178,610 $881 $— $— $178,610 $881 
U.S. Government agency securities365,833 3,024 54,266 1,974 420,099 4,998 
Mortgage-backed securities825,664 11,859 178,956 6,647 1,004,620 18,506 
State and municipal securities363,102 2,665 57,270 1,045 420,372 3,710 
Asset-backed securities198,349 2,595 6,513 190 204,862 2,785 
Corporate notes and other14,991 554 20,270 1,952 35,261 2,506 
Total temporarily-impaired securities$1,946,549 $21,578 $317,275 $11,808 $2,263,824 $33,386