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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, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,129,057 | $ 838,994
Gross Unrealized Gains | 23,463 | 7,206
Gross Unrealized Losses | (1,468) | (3,035)
Allowance for credit losses | (167) | 0
Estimated Fair Value | 1,150,885 | 843,165
U. S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 181,087 | 180,228
Gross Unrealized Gains | 1,461 | 621
Gross Unrealized Losses | (627) | (1,055)
Estimated Fair Value | 181,921 | 179,794
Residential mortgage backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 811,328 | 541,490
Gross Unrealized Gains | 14,506 | 4,337
Gross Unrealized Losses | (833) | (1,975)
Estimated Fair Value | 825,001 | 543,852
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 102,259 | 71,902
Gross Unrealized Gains | 5,872 | 2,034
Gross Unrealized Losses | 0 | (5)
Allowance for credit losses | (18) |
Estimated Fair Value | 108,113 | 73,931
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 34,383 | 10,530
Gross Unrealized Gains | 1,624 | 203
Gross Unrealized Losses | (8) |
Allowance for credit losses | (149) |
Estimated Fair Value | $ 35,850 | 10,733
U.S. Treasury |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 34,844
Gross Unrealized Gains |  | 11
Estimated Fair Value |  | $ 34,855

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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=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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