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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost	$ 750,653	$ 839,192
Investment securities	772,394	843,363
Investment securities.	772,394
U. S. agency securities
One year or less, amortized cost	34,038	96,332
After one year through five years, amortized cost	77,465	76,121
Five years through ten years, amortized cost	4,720	7,775
Amortized Cost	116,223	180,228
One year or less, estimated fair value	34,219	96,226
After one year through five years, estimated fair value	78,008	75,821
Five years through ten years, estimated fair value	4,827	7,747
Investment securities	117,054	179,794
Residential mortgage backed securities
Amortized cost, without maturity date	516,297	541,490
Amortized Cost	516,297	541,490
Estimated fair value, without maturity date	531,528	543,852
Investment securities	531,528	543,852
Municipal bonds
One year or less, amortized cost	7,382	5,897
After one year through five years, amortized cost	19,797	21,416
Five years through ten years, amortized cost	51,195	42,589
After ten years, amortized cost	8,000	2,000
Amortized Cost	86,374	71,902
One year or less, estimated fair value	7,437	5,969
After one year through five years, estimated fair value	20,703	21,953
Five years through ten years, estimated fair value	54,407	44,015
After ten years, estimated fair value	8,160	1,994
Investment securities	90,694	73,931
Corporate bonds
One year or less, amortized cost	10,929	502
After one year through five years, amortized cost	15,407	8,528
After ten years, amortized cost	5,225	1,500
Amortized Cost	31,561	10,530
One year or less, estimated fair value	11,312	508
After one year through five years, estimated fair value	15,999	8,725
After ten years, estimated fair value	5,734	1,500
Investment securities	32,920	10,733
U.S. Treasury
Amortized cost, without maturity date		34,844
Amortized Cost		34,844
Estimated fair value, without maturity date		34,855
Investment securities		34,855
Investment Securities
Amortized cost, without maturity date	198	198
Amortized Cost	198	198
Estimated fair value, without maturity date	198	198
Investment securities	$ 198	$ 198

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