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Securities (Tables)
 6 Months Ended
Jun. 30, 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 securities available-for-sale and held-to-maturity at June 30, 2020 and December 31, 2019 are summarized as follows:
 June 30, 2020
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Debt securities available-for-sale    
U.S. Treasury securities and obligations of U.S. government agencies$8,981  $418  $(1) $9,398  
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities636,528  24,747  (90) 661,185  
Private mortgage-backed securities and collateralized mortgage obligations75,756  1,645  (550) 76,851  
Collateralized loan obligations204,258  3  (5,444) 198,817  
Obligations of state and political subdivisions27,819  1,958  (3) 29,774  
Totals$953,342  $28,771  $(6,088) $976,025  
Debt securities held-to-maturity
Mortgage-backed securities of U.S. government-sponsored entities$227,092  $8,860  $(6) $235,946  
Totals$227,092  $8,860  $(6) $235,946  
 December 31, 2019
(In thousands)Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Debt securities available-for-sale    
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  
Debt securities held-to-maturity
Mortgage-backed securities of U.S. government-sponsored entities261,369  2,717  (1,873) 262,213  
Totals$261,369  $2,717  $(1,873) $262,213  
Summary of Amortized Cost and Fair Value of Held-to-Maturity Securities
The amortized cost, gross unrealized gains and losses and fair value of securities available-for-sale and held-to-maturity at June 30, 2020 and December 31, 2019 are summarized as follows:
 June 30, 2020
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Debt securities available-for-sale    
U.S. Treasury securities and obligations of U.S. government agencies$8,981  $418  $(1) $9,398  
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities636,528  24,747  (90) 661,185  
Private mortgage-backed securities and collateralized mortgage obligations75,756  1,645  (550) 76,851  
Collateralized loan obligations204,258  3  (5,444) 198,817  
Obligations of state and political subdivisions27,819  1,958  (3) 29,774  
Totals$953,342  $28,771  $(6,088) $976,025  
Debt securities held-to-maturity
Mortgage-backed securities of U.S. government-sponsored entities$227,092  $8,860  $(6) $235,946  
Totals$227,092  $8,860  $(6) $235,946  
 December 31, 2019
(In thousands)Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Debt securities available-for-sale    
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  
Debt securities held-to-maturity
Mortgage-backed securities of U.S. government-sponsored entities261,369  2,717  (1,873) 262,213  
Totals$261,369  $2,717  $(1,873) $262,213  
Summary of Investments Classified by Contractual Maturity Securities not due at a single maturity date are shown separately.
 Held to MaturityAvailable-for-Sale
(In thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in less than one year$—  $—  $2,100  $2,125  
Due after one year through five years—  —  8,655  9,063  
Due after five years through ten years—  —  8,577  9,200  
Due after ten years—  —  17,468  18,784  
 —  —  36,800  39,172  
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities227,092  235,946  636,528  661,185  
Private mortgage-backed securities and collateralized mortgage obligations—  —  75,756  76,851  
Collateralized loan obligations—  —  204,258  198,817  
Totals$227,092  $235,946  $953,342  $976,025  
Schedule of Debt Securities in Unrealized Loss Position The tables below indicate, at June 30, 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.
 June 30, 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$269  (1) $—  $—  $269  $(1) 
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities65,273  (74) 357  (16) 65,630  (90) 
Private mortgage-backed securities and collateralized mortgage obligations24,532  (550) —  —  24,532  (550) 
Collateralized loan obligations84,299  (1,638) 108,609  (3,806) 192,908  (5,444) 
Obligations of state and political subdivisions512  (3) —  —  512  (3) 
Totals$174,885  $(2,266) $108,966  $(3,822) $283,851  $(6,088) 
 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)