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Investment Securities Available-for-Sale - Amortized cost and estimated fair value of securities available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Amortized Cost	$ 839,192	$ 793,634
Gross Unrealized Gains	7,206	2,321
Gross Unrealized Losses	3,035	11,816
Estimated Fair Value	843,363	784,139
U. S. agency securities
Amortized Cost	180,228	260,150
Gross Unrealized Gains	621	228
Gross Unrealized Losses	1,055	4,033
Estimated Fair Value	179,794	256,345
Residential mortgage backed securities
Amortized Cost	541,490	477,949
Gross Unrealized Gains	4,337	1,575
Gross Unrealized Losses	1,975	7,293
Estimated Fair Value	543,852	472,231
Municipal bonds
Amortized Cost	71,902	45,814
Gross Unrealized Gains	2,034	439
Gross Unrealized Losses	5	484
Estimated Fair Value	73,931	45,769
Corporate bonds
Amortized Cost	10,530	9,503
Gross Unrealized Gains	203	79
Gross Unrealized Losses		6
Estimated Fair Value	10,733	9,576
U.S. Treasury
Amortized Cost	34,844
Gross Unrealized Gains	11
Estimated Fair Value	34,855
Other equity investments
Amortized Cost	198	218
Estimated Fair Value	$ 198	$ 218

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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