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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost [Abstract]
Amortized Cost	$ 1,789,416	$ 1,129,255
Estimated Fair Value [Abstract]
Allowance for Credit Losses	(256)	(167)
Estimated Fair Value	1,786,659	1,151,083
U. S. agency securities
Amortized Cost [Abstract]
One year or less	182,385	53,916
After one year through five years	97,969	110,083
Five years through ten years	76,272	17,087
Amortized Cost	356,626	181,087
Estimated Fair Value [Abstract]
One year or less	180,838	53,906
After one year through five years	98,179	110,777
Five years through ten years	74,689	17,240
Residential mortgage backed securities
Amortized Cost [Abstract]
Residential mortgage backed securities	1,206,867	811,328
Amortized Cost	1,206,867	811,328
Estimated Fair Value [Abstract]
Residential mortgage backed securities	1,203,136	825,001
Municipal bonds
Amortized Cost [Abstract]
One year or less	3,909	4,329
After one year through five years	24,618	26,622
Five years through ten years	70,937	69,309
After ten years	20,047	2,000
Amortized Cost	119,511	102,259
Estimated Fair Value [Abstract]
One year or less	3,962	4,348
After one year through five years	26,133	28,272
Five years through ten years	73,293	73,389
After ten years	19,778	2,121
Corporate bonds
Amortized Cost [Abstract]
One year or less	13,928	5,218
After one year through five years	38,111	22,189
Five years through ten years	29,337	6,976
After ten years	0
Amortized Cost	81,376	34,383
Estimated Fair Value [Abstract]
One year or less	14,148	5,220
After one year through five years	38,384	23,267
Five years through ten years	29,323	7,511
After ten years	0
U.S. treasuries
Amortized Cost [Abstract]
After one year through five years	24,838	0
Amortized Cost	24,838
Estimated Fair Value [Abstract]
After one year through five years	24,854	0
Other
Amortized Cost [Abstract]
Residential mortgage backed securities	198	198
Amortized Cost	198	198
Estimated Fair Value [Abstract]
Residential mortgage backed securities	$ 198	$ 198

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