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Securities (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021 and 2020 are summarized as follows (in thousands):
Amortized CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
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 notes114,355 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 
December 31, 2020    
Securities available-for-sale:    
U.S Treasury securities$82,199 $10 $— $82,209 
U.S. Government agency securities74,916 1,547 60 76,403 
Mortgage-backed securities1,623,759 67,759 2,327 1,689,191 
State and municipal securities1,411,288 44,559 12,484 1,443,363 
Asset-backed securities177,878 715 657 177,936 
Corporate notes117,256 2,632 2,309 117,579 
 $3,487,296 $117,222 $17,837 $3,586,681 
Securities held-to-maturity:    
State and municipal securities1,028,550 38,272 291 1,066,531 
 $1,028,550 $38,272 $291 $1,066,531 
Allowance for credit losses - securities held-to-maturity(191)
Securities held-to-maturity, net of allowance for credit losses$1,028,359 
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity The amortized cost and fair value of debt securities as of December 31, 2021 by contractual maturity are 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$103,578 $103,533 $— $— 
Due in one year to five years320,844 321,710 13,330 13,342 
Due in five years to ten years507,968 513,643 5,648 5,728 
Due after ten years1,785,185 1,825,500 1,030,586 1,062,534 
Mortgage-backed securities1,908,675 1,920,239 106,555 106,445 
Asset-backed securities232,294 229,569 — — 
 $4,858,544 $4,914,194 $1,156,119 $1,188,049 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value At December 31, 2021 and 2020, included in securities 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, 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 notes14,991 554 20,270 1,952 35,261 2,506 
Total temporarily-impaired securities$1,946,549 $21,578 $317,275 $11,808 $2,263,824 $33,386 
December 31, 2020      
U.S. Treasury securities$— $— $— $— $— $— 
U.S. Government agency securities9,962 38 6,091 22 16,053 60 
Mortgage-backed securities165,696 1,772 35,997 555 201,693 2,327 
State and municipal securities175,115 2,220 345,435 10,264 520,550 12,484 
Asset-backed securities46,399 207 52,840 450 99,239 657 
Corporate notes9,978 40 23,920 2,269 33,898 2,309 
Total temporarily-impaired securities$407,150 $4,277 $464,283 $13,560 $871,433 $17,837