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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details)
 6 Months Ended
Jun. 30, 2021
USD ($)
security
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
security
Number  of Securities      
Less than 12 months | security 89   32
12 months or longer | security 2   1
Total | security 91   33
Fair  Value      
Less than 12 months $ 1,082,336,000   $ 370,123,000
12 months or longer 4,279,000   4,119,000
Total 1,086,615,000   374,242,000
Gross Unrealized Losses      
Less than 12 months (10,583,000)   (982,000)
12 months or longer (725,000)   (881,000)
Total (11,308,000)   (1,863,000)
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 20   22
12 months or longer | security 1   0
Total | security 21   22
Fair  Value      
Less than 12 months $ 421,753,000   $ 312,757,000
12 months or longer 4,000   0
Total 421,757,000   312,757,000
Gross Unrealized Losses      
Less than 12 months (2,389,000)   (844,000)
12 months or longer 0   0
Total (2,389,000)   $ (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 47   8
12 months or longer | security 0   0
Total | security 47   8
Fair  Value      
Less than 12 months $ 503,686,000   $ 46,094,000
12 months or longer 0   0
Total 503,686,000   46,094,000
Gross Unrealized Losses      
Less than 12 months (6,148,000)   (114,000)
12 months or longer 0   0
Total (6,148,000)   (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 11   1
12 months or longer | security 0   0
Total | security 11   1
Fair  Value      
Less than 12 months $ 115,974,000   $ 10,275,000
12 months or longer 0   0
Total 115,974,000   10,275,000
Gross Unrealized Losses      
Less than 12 months (1,738,000)   (21,000)
12 months or longer 0   0
Total (1,738,000)   (21,000)
Allowance for credit losses for available for sale securities $ 0   $ 0
Corporate securities      
Number  of Securities      
Less than 12 months | security 2   0
12 months or longer | security 1   1
Total | security 3   1
Fair  Value      
Less than 12 months $ 7,219,000   $ 0
12 months or longer 4,275,000   4,119,000
Total 11,494,000   4,119,000
Gross Unrealized Losses      
Less than 12 months (203,000)   0
12 months or longer (725,000)   (881,000)
Total (928,000)   (881,000)
Allowance for credit losses for available for sale securities $ 0   $ 0
Municipal securities      
Number  of Securities      
Less than 12 months | security 5   1
12 months or longer | security 0   0
Total | security 5   1
Fair  Value      
Less than 12 months $ 4,704,000   $ 997,000
12 months or longer 0   0
Total 4,704,000   997,000
Gross Unrealized Losses      
Less than 12 months (44,000)   (3,000)
12 months or longer 0   0
Total (44,000)   (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 91.00%    
Asset-backed Securities      
Number  of Securities      
Less than 12 months | security 4    
12 months or longer | security 0    
Total | security 4    
Fair  Value      
Less than 12 months $ 29,000,000    
12 months or longer 0    
Total 29,000,000    
Gross Unrealized Losses      
Less than 12 months (61,000)    
12 months or longer 0    
Total (61,000)    
Allowance for credit losses for available for sale securities $ 0