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Securities (Tables)
 12 Months Ended
Dec. 31, 2022
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 ("AFS") and held-to-maturity ("HTM") securities at December 31, 2022 and December 31, 2021 are summarized as follows:
 December 31, 2022
(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$13,813 $173 $(339)$13,647 
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,561,197 539 (223,083)1,338,653 
Private mortgage-backed securities and collateralized mortgage obligations179,148 70 (12,831)166,387 
Collateralized loan obligations313,155 — (10,251)302,904 
Obligations of state and political subdivisions29,350 122 (1,731)27,741 
Other debt securities22,640 197 (427)22,410 
Totals$2,119,303 $1,101 $(248,662)$1,871,742 
Held-to-Maturity Debt Securities     
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$747,408 $64 $(129,731)$617,741 
Totals$747,408 $64 $(129,731)$617,741 
 
 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 of U.S. government-sponsored entities$638,640 $3,828 $(15,070)$627,398 
Totals$638,640 $3,828 $(15,070)$627,398 
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 ("AFS") and held-to-maturity ("HTM") securities at December 31, 2022 and December 31, 2021 are summarized as follows:
 December 31, 2022
(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$13,813 $173 $(339)$13,647 
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,561,197 539 (223,083)1,338,653 
Private mortgage-backed securities and collateralized mortgage obligations179,148 70 (12,831)166,387 
Collateralized loan obligations313,155 — (10,251)302,904 
Obligations of state and political subdivisions29,350 122 (1,731)27,741 
Other debt securities22,640 197 (427)22,410 
Totals$2,119,303 $1,101 $(248,662)$1,871,742 
Held-to-Maturity Debt Securities     
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$747,408 $64 $(129,731)$617,741 
Totals$747,408 $64 $(129,731)$617,741 
 
 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 of U.S. government-sponsored entities$638,640 $3,828 $(15,070)$627,398 
Totals$638,640 $3,828 $(15,070)$627,398 
Summary of Investments Classified by Contractual Maturity Securities not due at a single maturity date are shown separately.
 Held-to-MaturityAvailable-for-Sale
(In thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in less than one year$— $— $1,990 $2,087 
Due after one year through five years— — 17,509 17,419 
Due after five years through ten years— — 3,123 3,030 
Due after ten years— — 20,541 18,852 
 — — 43,163 41,388 
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$747,408 $617,741 $1,561,197 $1,338,653 
Private mortgage-backed securities and collateralized mortgage obligations— — 179,148 166,387 
Collateralized loan obligations— — 313,155 302,904 
Other debt securities— — 22,640 22,410 
Totals$747,408 $617,741 $2,119,303 $1,871,742 
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, 2022
 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$3,788 $(328)$249 $(11)$4,037 $(339)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities646,651 (54,956)667,520 (168,127)1,314,171 (223,083)
Private mortgage-backed securities and collateralized mortgage obligations130,488 (8,255)25,234 (4,576)155,722 (12,831)
Collateralized loan obligations242,370 (8,343)60,534 (1,908)302,904 (10,251)
Obligations of state and political subdivisions23,804 (1,656)425 (75)24,229 (1,731)
Other debt securities11,459 (427)— — 11,459 (427)
Totals$1,058,560 $(73,965)$753,962 $(174,697)$1,812,522 $(248,662)
 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)