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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Investment Holdings [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI | $ 0 | $ 0
Amortized Cost | 1,029,001,000 | 770,195,000
Gross Unrealized Gains | 24,824,000 | 32,521,000
Gross Unrealized Losses | (4,301,000) | (553,000)
Fair Value | 1,049,524,000 | 802,163,000
U.S. government and agency securities |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 104,688,000 | 44,713,000
Gross Unrealized Gains | 477,000 | 947,000
Gross Unrealized Losses | (1,518,000) | 0
Fair Value | 103,647,000 | 45,660,000
Municipal securities |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 219,174,000 | 197,634,000
Gross Unrealized Gains | 10,341,000 | 12,561,000
Gross Unrealized Losses | (588,000) | (227,000)
Fair Value | 228,927,000 | 209,968,000
Residential CMO and MBS |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 256,875,000 | 196,956,000
Gross Unrealized Gains | 3,465,000 | 5,125,000
Gross Unrealized Losses | (846,000) | (209,000)
Fair Value |  | 201,872,000
Commercial CMO and MBS |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 413,304,000 | 290,638,000
Gross Unrealized Gains | 9,973,000 | 13,198,000
Gross Unrealized Losses | (1,337,000) | (90,000)
Fair Value |  | 303,746,000
Corporate obligations |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 7,004,000 | 10,971,000
Gross Unrealized Gains | 17,000 | 125,000
Gross Unrealized Losses | (3,000) | 0
Fair Value |  | 11,096,000
Other asset-backed securities |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 27,956,000 | 29,283,000
Gross Unrealized Gains | 551,000 | 565,000
Gross Unrealized Losses | $ (9,000) | (27,000)
Fair Value |  | $ 29,821,000

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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=123581744&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=123581744&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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