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Investment Securities Available-for-Sale - Amortized cost and estimated fair value of securities available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost	$ 750,653	$ 839,192
Gross Unrealized Gains	22,821	7,206
Gross Unrealized Losses	942	3,035
Allowance for Credit Losses	138	0
Investment securities	772,394	843,363
U. S. agency securities
Amortized Cost	116,223	180,228
Gross Unrealized Gains	1,580	621
Gross Unrealized Losses	749	1,055
Investment securities	117,054	179,794
Residential mortgage backed securities
Amortized Cost	516,297	541,490
Gross Unrealized Gains	15,346	4,337
Gross Unrealized Losses	115	1,975
Investment securities	531,528	543,852
Municipal bonds
Amortized Cost	86,374	71,902
Gross Unrealized Gains	4,333	2,034
Gross Unrealized Losses		5
Allowance for Credit Losses	13
Investment securities	90,694	73,931
Corporate bonds
Amortized Cost	31,561	10,530
Gross Unrealized Gains	1,562	203
Gross Unrealized Losses	78
Allowance for Credit Losses	125
Investment securities	32,920	10,733
U.S. Treasury
Amortized Cost		34,844
Gross Unrealized Gains		11
Investment securities		34,855
Investment Securities
Amortized Cost	198	198
Investment securities	$ 198	$ 198

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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