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Investment Securities - Reconciliation (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 770,195 | $ 939,160
Gross Unrealized Gains | 32,521 | 14,660
Gross Unrealized Losses | (553) | (1,508)
Fair Value | 802,163 | 952,312
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 44,713 | 104,709
Gross Unrealized Gains | 947 | 598
Gross Unrealized Losses | 0 | (84)
Fair Value | 45,660 | 105,223
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 197,634 | 128,183
Gross Unrealized Gains | 12,561 | 4,933
Gross Unrealized Losses | (227) | (102)
Fair Value | 209,968 | 133,014
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 196,956 | 336,929
Gross Unrealized Gains | 5,125 | 3,184
Gross Unrealized Losses | (209) | (505)
Fair Value | 201,872 | 339,608
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 290,638 | 322,169
Gross Unrealized Gains | 13,198 | 5,575
Gross Unrealized Losses | (90) | (649)
Fair Value | 303,746 | 327,095
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,971 | 23,893
Gross Unrealized Gains | 125 | 316
Gross Unrealized Losses | 0 | (15)
Fair Value | 11,096 | 24,194
Other Security Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 29,283 | 23,277
Gross Unrealized Gains | 565 | 54
Gross Unrealized Losses | (27) | (153)
Fair Value | $ 29,821 | $ 23,178

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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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