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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized Cost | $ 1,402,144 | $ 1,460,033
Gross Unrealized Gains | 74 | 205
Gross Unrealized Losses | (125,668) | (128,795)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 1,276,550 | 1,331,443
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively) | 754,276 | 766,396
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (89,466) |
Total investment securities | 664,810 | 673,434
Fair Value, Recurring [Member] |  |
Investment Holdings [Line Items] |  |
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively) |  | 766,396
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | (92,962)
Total investment securities |  | 673,434
U.S. government and agency securities |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 68,514 | 68,912
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4,255) | (5,053)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 64,259 | 63,859
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively) | 151,005 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (30,245) |
Total investment securities | 120,760 |
U.S. government and agency securities | Fair Value, Recurring [Member] |  |
Investment Holdings [Line Items] |  |
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively) |  | 150,936
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | (33,585)
Total investment securities |  | 117,351
Municipal securities |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 145,681 | 171,087
Gross Unrealized Gains | 48 | 172
Gross Unrealized Losses | (15,714) | (18,233)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 130,015 | 153,026
Residential CMO and MBS(1) |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 465,625 | 479,473
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (54,653) | (55,087)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 410,972 | 424,386
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively) | 280,032 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (17,219) |
Total investment securities | 262,813 |
Residential CMO and MBS(1) | Fair Value, Recurring [Member] |  |
Investment Holdings [Line Items] |  |
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively) |  | 290,318
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | (17,440)
Total investment securities |  | 272,878
Commercial CMO and MBS(1) |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 698,833 | 714,136
Gross Unrealized Gains | 17 | 19
Gross Unrealized Losses | (50,509) | (49,734)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 648,341 | 664,421
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively) | 323,239 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (42,002) |
Total investment securities | 281,237 |
Commercial CMO and MBS(1) | Fair Value, Recurring [Member] |  |
Investment Holdings [Line Items] |  |
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively) |  | 325,142
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | (41,937)
Total investment securities |  | 283,205
Corporate obligations |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 4,000 | 4,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (226) | (166)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 3,774 | 3,834
Other asset-backed securities |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 19,491 | 22,425
Gross Unrealized Gains | 9 | 14
Gross Unrealized Losses | (311) | (522)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 19,189 | $ 21,917

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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