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Securities (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost and Fair Value of Securities Available for Sale
The amortized cost, gross unrealized gains and losses and fair value of available-for-sale and held-to-maturity securities at December 31, 2021 and December 31, 2020 are summarized as follows:
 December 31, 2021
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Available-for-Sale Debt Securities     
U.S. Treasury securities and obligations of U.S. government agencies$6,466 $316 $(3)$6,779 
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,234,721 8,308 (20,309)1,222,720 
Private mortgage-backed securities and collateralized mortgage obligations88,096 1,091 (420)88,767 
Collateralized loan obligations292,751 63 (124)292,690 
Obligations of state and political subdivisions31,624 1,740 (1)33,363 
Totals$1,653,658 $11,518 $(20,857)$1,644,319 
Held-to-Maturity Debt Securities     
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$638,640 $3,828 $(15,070)$627,398 
Totals$638,640 $3,828 $(15,070)$627,398 
 
 December 31, 2020
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Available-for-Sale Debt Securities     
U.S. Treasury securities and obligations of U.S. government agencies$8,250 $528 $(1)$8,777 
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,038,437 23,457 (1,240)1,060,654 
Private mortgage-backed securities and collateralized mortgage obligations89,284 2,131 (210)91,205 
Collateralized loan obligations202,563 279 (647)202,195 
Obligations of state and political subdivisions33,005 2,321 — 35,326 
Totals$1,371,539 $28,716 $(2,098)$1,398,157 
Held-to-Maturity Debt Securities
Mortgage-backed securities of U.S. government-sponsored entities$184,484 $7,818 $(123)$192,179 
Totals$184,484 $7,818 $(123)$192,179 
Summary of Amortized Cost and Fair Value of Securities Held to Maturity
The amortized cost, gross unrealized gains and losses and fair value of available-for-sale and held-to-maturity securities at December 31, 2021 and December 31, 2020 are summarized as follows:
 December 31, 2021
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Available-for-Sale Debt Securities     
U.S. Treasury securities and obligations of U.S. government agencies$6,466 $316 $(3)$6,779 
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,234,721 8,308 (20,309)1,222,720 
Private mortgage-backed securities and collateralized mortgage obligations88,096 1,091 (420)88,767 
Collateralized loan obligations292,751 63 (124)292,690 
Obligations of state and political subdivisions31,624 1,740 (1)33,363 
Totals$1,653,658 $11,518 $(20,857)$1,644,319 
Held-to-Maturity Debt Securities     
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$638,640 $3,828 $(15,070)$627,398 
Totals$638,640 $3,828 $(15,070)$627,398 
 
 December 31, 2020
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Available-for-Sale Debt Securities     
U.S. Treasury securities and obligations of U.S. government agencies$8,250 $528 $(1)$8,777 
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,038,437 23,457 (1,240)1,060,654 
Private mortgage-backed securities and collateralized mortgage obligations89,284 2,131 (210)91,205 
Collateralized loan obligations202,563 279 (647)202,195 
Obligations of state and political subdivisions33,005 2,321 — 35,326 
Totals$1,371,539 $28,716 $(2,098)$1,398,157 
Held-to-Maturity Debt Securities
Mortgage-backed securities of U.S. government-sponsored entities$184,484 $7,818 $(123)$192,179 
Totals$184,484 $7,818 $(123)$192,179 
Summary of Investments Classified by Contractual Maturity Securities not due at a single maturity date are shown separately.
 Held-to-MaturityAvailable-for-Sale
(In thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in less than one year$— $— $2,174 $2,210 
Due after one year through five years— — 14,017 14,841 
Due after five years through ten years— — 7,041 7,341 
Due after ten years— — 14,858 15,750 
 — — 38,090 40,142 
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities638,640 627,398 1,234,721 1,222,720 
Private mortgage-backed securities and collateralized mortgage obligations— — 88,096 88,767 
Collateralized loan obligations— — 292,751 292,690 
Totals$638,640 $627,398 $1,653,658 $1,644,319 
Schedule of Unrealized Loss and Fair Value on Investments The tables below indicate the fair value of available-for-sale debt securities with unrealized losses for which no allowance for credit losses has been recorded.
 December 31, 2021
 Less than 12 months12 months or longerTotal
(In thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
U.S. Treasury securities and obligations of U.S. government agencies$97 $(1)$245 $(2)$342 $(3)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities955,881 (19,575)11,953 (734)967,834 (20,309)
Private mortgage-backed securities and collateralized mortgage obligations33,640 (173)9,628 (247)43,268 (420)
Collateralized loan obligations123,202 (81)9,461 (43)132,663 (124)
Obligations of state and political subdivisions499 (1)— — 499 (1)
Totals$1,113,319 $(19,831)$31,287 $(1,026)$1,144,606 $(20,857)
 December 31, 2020
 Less than 12 months12 months or longerTotal
(In thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
U.S. Treasury securities and obligations of U.S. government agencies$— $— $256 $(1)$256 $(1)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities203,405 (1,218)569 (22)203,974 (1,240)
Private mortgage-backed securities and collateralized mortgage obligations23,997 (210)— — 23,997 (210)
Collateralized loan obligations104,697 (102)72,513 (545)177,210 (647)
Totals$332,099 $(1,530)$73,338 $(568)$405,437 $(2,098)