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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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- 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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