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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details)
 3 Months Ended
Mar. 31, 2021
USD ($)
security
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
security
Number  of Securities      
Less than 12 months | security 95   32
12 months or longer | security 3   1
Total | security 98   33
Fair  Value      
Less than 12 months $ 1,141,449,000   $ 370,123,000
12 months or longer 6,541,000   4,119,000
Total 1,147,990,000   374,242,000
Gross Unrealized Losses      
Less than 12 months (22,161,000)   (982,000)
12 months or longer (832,000)   (881,000)
Total (22,993,000)   (1,863,000)
Accrued interest receivable for investment securities available for sale 4,500,000   4,700,000
Allowance for credit losses for available for sale securities 0   $ 0
Net gains on sales of securities available for sale $ 0 $ 0  
Collateralized mortgage obligations      
Number  of Securities      
Less than 12 months | security 24   22
12 months or longer | security 2   0
Total | security 26   22
Fair  Value      
Less than 12 months $ 453,139,000   $ 312,757,000
12 months or longer 2,347,000   0
Total 455,486,000   312,757,000
Gross Unrealized Losses      
Less than 12 months (6,475,000)   (844,000)
12 months or longer (25,000)   0
Total (6,500,000)   $ (844,000)
Allowance for credit losses for available for sale securities 0    
Mortgage-backed securities      
Gross Unrealized Losses      
Allowance for credit losses for available for sale securities $ 0    
Mortgage-backed securities: Residential      
Number  of Securities      
Less than 12 months | security 44   8
12 months or longer | security 0   0
Total | security 44   8
Fair  Value      
Less than 12 months $ 507,249,000   $ 46,094,000
12 months or longer 0   0
Total 507,249,000   46,094,000
Gross Unrealized Losses      
Less than 12 months (11,771,000)   (114,000)
12 months or longer 0   0
Total (11,771,000)   (114,000)
Allowance for credit losses for available for sale securities $ 0   $ 0
Mortgage-backed securities: Commercial      
Number  of Securities      
Less than 12 months | security 13   1
12 months or longer | security 0   0
Total | security 13   1
Fair  Value      
Less than 12 months $ 136,164,000   $ 10,275,000
12 months or longer 0   0
Total 136,164,000   10,275,000
Gross Unrealized Losses      
Less than 12 months (3,118,000)   (21,000)
12 months or longer 0   0
Total (3,118,000)   (21,000)
Allowance for credit losses for available for sale securities $ 0   $ 0
Corporate securities      
Number  of Securities      
Less than 12 months | security 3   0
12 months or longer | security 1   1
Total | security 4   1
Fair  Value      
Less than 12 months $ 9,011,000   $ 0
12 months or longer 4,194,000   4,119,000
Total 13,205,000   4,119,000
Gross Unrealized Losses      
Less than 12 months (423,000)   0
12 months or longer (807,000)   (881,000)
Total (1,230,000)   (881,000)
Allowance for credit losses for available for sale securities $ 0   $ 0
Municipal securities      
Number  of Securities      
Less than 12 months | security 10   1
12 months or longer | security 0   0
Total | security 10   1
Fair  Value      
Less than 12 months $ 31,371,000   $ 997,000
12 months or longer 0   0
Total 31,371,000   997,000
Gross Unrealized Losses      
Less than 12 months (338,000)   (3,000)
12 months or longer 0   0
Total (338,000)   (3,000)
Allowance for credit losses for available for sale securities $ 0   $ 0
U.S. Government Agency and U.S. Government Sponsored Enterprises      
Gross Unrealized Losses      
Percentage of portfolio 93.00%    
Asset-backed Securities      
Number  of Securities      
Less than 12 months | security 1    
12 months or longer | security 0    
Total | security 1    
Fair  Value      
Less than 12 months $ 4,515,000    
12 months or longer 0    
Total 4,515,000    
Gross Unrealized Losses      
Less than 12 months (36,000)    
12 months or longer 0    
Total (36,000)    
Allowance for credit losses for available for sale securities $ 0