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Investment Securities Available-for-Sale - Amortized cost and estimated fair value of securities available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost	$ 838,831	$ 839,192
Gross Unrealized Gains	21,379	7,206
Gross Unrealized Losses	1,294	3,035
Investment securities	858,916	843,363
U. S. agency securities
Amortized Cost	146,948	180,228
Gross Unrealized Gains	1,527	621
Gross Unrealized Losses	716	1,055
Investment securities	147,759	179,794
Residential mortgage backed securities
Amortized Cost	531,784	541,490
Gross Unrealized Gains	16,110	4,337
Gross Unrealized Losses	506	1,975
Investment securities	547,388	543,852
Municipal bonds
Amortized Cost	72,828	71,902
Gross Unrealized Gains	2,760	2,034
Gross Unrealized Losses		5
Investment securities	75,588	73,931
Corporate bonds
Amortized Cost	52,087	10,530
Gross Unrealized Gains	969	203
Gross Unrealized Losses	72
Investment securities	52,984	10,733
U.S. Treasury
Amortized Cost	34,986	34,844
Gross Unrealized Gains	13	11
Investment securities	34,999	34,855
Other equity investments
Amortized Cost	198	198
Investment securities	$ 198	$ 198

X

- Definition

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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