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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, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,674,264 | $ 1,129,057
Gross Unrealized Gains | 18,149 | 23,463
Gross Unrealized Losses | (11,449) | (1,468)
Allowance for credit losses | (132) | (167)
Investment securities | 1,680,832 | 1,150,885
U. S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 359,339 | 181,087
Gross Unrealized Gains | 1,539 | 1,461
Gross Unrealized Losses | (3,567) | (627)
Investment securities | 357,311 | 181,921
Residential mortgage backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,143,931 | 811,328
Gross Unrealized Gains | 9,944 | 14,506
Gross Unrealized Losses | (7,553) | (833)
Investment securities | 1,146,322 | 825,001
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 95,444 | 102,259
Gross Unrealized Gains | 4,925 | 5,872
Gross Unrealized Losses | (90) |
Allowance for credit losses | (2) | (18)
Investment securities | 100,277 | 108,113
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 75,550 | 34,383
Gross Unrealized Gains | 1,741 | 1,624
Gross Unrealized Losses | (239) | (8)
Allowance for credit losses | (130) | (149)
Investment securities | $ 76,922 | $ 35,850

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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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