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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Amortized Cost    
Amortized Cost $ 1,129,057 $ 838,994
Estimated Fair Value    
Allowance for credit losses (167) 0
Estimated Fair Value 1,150,885 843,165
U. S. agency securities    
Amortized Cost    
One year or less, amortized cost 53,916 96,332
After one year through five years, amortized cost 110,083 76,121
Five years through ten years, amortized cost 17,087 7,775
Amortized Cost 181,087 180,228
Estimated Fair Value    
One year or less, estimated fair value 53,906 96,226
After one year through five years, estimated fair value 110,777 75,821
Five years through ten years, estimated fair value 17,240 7,747
Estimated Fair Value 181,921 179,794
Residential mortgage backed securities    
Amortized Cost    
Amortized cost, without maturity date 811,328 541,490
Amortized Cost 811,328 541,490
Estimated Fair Value    
Estimated fair value, without maturity date 825,001 543,852
Estimated Fair Value 825,001 543,852
Municipal bonds    
Amortized Cost    
One year or less, amortized cost 4,329 5,897
After one year through five years, amortized cost 26,622 21,416
Five years through ten years, amortized cost 69,309 42,589
After ten years, amortized cost 2,000 2,000
Amortized Cost 102,259 71,902
Estimated Fair Value    
One year or less, estimated fair value 4,348 5,969
After one year through five years, estimated fair value 28,272 21,953
Five years through ten years, estimated fair value 73,389 44,015
After ten years, estimated fair value 2,121 1,994
Allowance for credit losses (18)  
Estimated Fair Value 108,113 73,931
Corporate bonds    
Amortized Cost    
One year or less, amortized cost 5,218 502
After one year through five years, amortized cost 22,189 8,528
Five years through ten years, amortized cost 6,976  
After ten years, amortized cost   1,500
Amortized Cost 34,383 10,530
Estimated Fair Value    
One year or less, estimated fair value 5,220 508
After one year through five years, estimated fair value 23,267 8,725
Five years through ten years, estimated fair value 7,511  
After ten years, estimated fair value   1,500
Allowance for credit losses (149)  
Estimated Fair Value $ 35,850 10,733
U.S. Treasury    
Amortized Cost    
Amortized cost, without maturity date   34,844
Amortized Cost   34,844
Estimated Fair Value    
Estimated fair value, without maturity date   34,855
Estimated Fair Value   $ 34,855