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Securities (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020 and December 31, 2019 are summarized as follows:
 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 
 
 December 31, 2019
(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$9,914 $204 $(4)$10,114 
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities604,934 5,784 (1,511)609,207 
Private mortgage-backed securities and collateralized mortgage obligations56,005 1,561 (5)57,561 
Collateralized loan obligations239,364 7 (1,153)238,218 
Obligations of state and political subdivisions30,548 1,208 (1)31,755 
Totals$940,765 $8,764 $(2,674)$946,855 
Held-to-Maturity Debt Securities
Mortgage-backed securities of U.S. government-sponsored entities$261,369 $2,717 $(1,873)$262,213 
Totals$261,369 $2,717 $(1,873)$262,213 
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, 2020 and December 31, 2019 are summarized as follows:
 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 
 
 December 31, 2019
(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$9,914 $204 $(4)$10,114 
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities604,934 5,784 (1,511)609,207 
Private mortgage-backed securities and collateralized mortgage obligations56,005 1,561 (5)57,561 
Collateralized loan obligations239,364 7 (1,153)238,218 
Obligations of state and political subdivisions30,548 1,208 (1)31,755 
Totals$940,765 $8,764 $(2,674)$946,855 
Held-to-Maturity Debt Securities
Mortgage-backed securities of U.S. government-sponsored entities$261,369 $2,717 $(1,873)$262,213 
Totals$261,369 $2,717 $(1,873)$262,213 
Summary of Investments Classified by Contractual Maturity Securities not due at a single maturity date are shown separately.
 Held-to-MaturityAvailable-for-Sale
(In thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in less than one year$— $— $35 $35 
Due after one year through five years— — 11,305 11,929 
Due after five years through ten years— — 8,590 9,323 
Due after ten years— — 21,325 22,816 
 — — 41,255 44,103 
Mortgage-backed securities of U.S. government-sponsored entities184,484 192,179 1,038,437 1,060,654 
Private mortgage-backed securities and collateralized mortgage obligations— — 89,284 91,205 
Collateralized loan obligations— — 202,563 202,195 
Totals$184,484 $192,179 $1,371,539 $1,398,157 
Schedule of Unrealized Loss and Fair Value on Investments The tables below indicate, at December 31, 2020, the fair value of available-for-sale debt securities with unrealized losses for which no allowance for credit losses has been recorded, and at December 31, 2019, the fair value of available-for-sale and held-to-maturity debt securities with unrealized losses for which no allowance has been recorded.
 December 31, 2020
 Less than 12 months12 months or longerTotal
(In thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
U.S. Treasury securities and obligations of U.S. government agencies$— $— $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)
 December 31, 2019
 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$758 $(4)$— $— $758 $(4)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities220,057 (1,461)104,184 (1,923)324,241 (3,384)
Private mortgage-backed securities and collateralized mortgage obligations2,978 (5)— — 2,978 (5)
Collateralized loan obligations88,680 (570)110,767 (583)199,447 (1,153)
Obligations of state and political subdivisions515 (1)— — 515 (1)
Totals$312,988 $(2,041)$214,951 $(2,506)$527,939 $(4,547)