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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized cost | $ 1,424,969 |
Total investment securities available for sale | 1,318,072 | $ 1,331,443
Investment securities held to maturity, at amortized cost, net (fair value of $684,647 and $673,434, respectively) | 760,163 | 766,396
Total investment securities | 684,647 | 673,434
Fair Value, Recurring [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 1,424,969 | 1,460,033
Gross Unrealized Gains | 265 | 205
Gross Unrealized Losses | (107,162) | (128,795)
Total investment securities available for sale | 1,318,072 | 1,331,443
Investment securities held to maturity, at amortized cost, net (fair value of $684,647 and $673,434, respectively) | 760,163 | 766,396
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 12 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (75,528) | (92,962)
Total investment securities | 684,647 | 673,434
U.S. government and agency securities | Fair Value, Recurring [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 68,514 | 68,912
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,964) | (5,053)
Total investment securities available for sale | 64,550 | 63,859
Investment securities held to maturity, at amortized cost, net (fair value of $684,647 and $673,434, respectively) | 150,969 | 150,936
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (28,298) | (33,585)
Total investment securities | 122,671 | 117,351
Municipal securities | Fair Value, Recurring [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 146,525 | 171,087
Gross Unrealized Gains | 218 | 172
Gross Unrealized Losses | (14,246) | (18,233)
Total investment securities available for sale | 132,497 | 153,026
Residential CMO and MBS | Fair Value, Recurring [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 481,380 | 479,473
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (47,668) | (55,087)
Total investment securities available for sale | 433,712 | 424,386
Investment securities held to maturity, at amortized cost, net (fair value of $684,647 and $673,434, respectively) | 285,337 | 290,318
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 12 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (12,315) | (17,440)
Total investment securities | 273,034 | 272,878
Commercial CMO and MBS | Fair Value, Recurring [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 704,156 | 714,136
Gross Unrealized Gains | 47 | 19
Gross Unrealized Losses | (40,706) | (49,734)
Total investment securities available for sale | 663,497 | 664,421
Investment securities held to maturity, at amortized cost, net (fair value of $684,647 and $673,434, respectively) | 323,857 | 325,142
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (34,915) | (41,937)
Total investment securities | 288,942 | 283,205
Corporate obligations | Fair Value, Recurring [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 4,000 | 4,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (183) | (166)
Total investment securities available for sale | 3,817 | 3,834
Other asset-backed securities | Fair Value, Recurring [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 20,394 | 22,425
Gross Unrealized Gains | 0 | 14
Gross Unrealized Losses | (395) | (522)
Total investment securities available for sale | $ 19,999 | $ 21,917

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