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Securities - Schedule of Debt Securities, Available-for-Sale and Held-to-Maturity (Details) - USD ($) | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Securities Financing Transaction [Line Items] |  |  |  |  |  |
Available-for-sale, amortized cost | $ 488,018,000 |  | $ 503,404,000 |  |  |
Available-for-sale, gross unrealized gains | 0 |  | 1,000 |  |  |
Available-for-sale, gross unrealized losses | (34,810,000) |  | (45,757,000) |  |  |
Available-for-sale, fair value | 453,208,000 |  | 457,648,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Amortized Cost | 1,192,166,000 |  | 1,224,564,000 |  |  |
Held-to-maturity, gross unrealized gains | 422,000 |  | 1,244,000 |  |  |
Held-to-maturity, gross unrealized losses | (145,246,000) |  | (115,767,000) |  |  |
Debt securities held-to-maturity | 1,047,342,000 |  | 1,110,041,000 |  |  |
Allowance for Credit Losses | (932,000) | $ (964,000) | (1,128,000) | $ (1,234,000) | $ (1,293,000) | $ (1,467,000)
Total, amortized cost | 1,680,184,000 |  | 1,727,968,000 |  |  |
Total, gross unrealized gains | 422,000 |  | 1,245,000 |  |  |
Total, gross unrealized losses | (180,056,000) |  | (161,524,000) |  |  |
Total, estimated fair value | 1,500,550,000 |  | 1,567,689,000 |  |  |
U.S. government and agency obligations |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Available-for-sale, amortized cost | 71,895,000 |  | 87,648,000 |  |  |
Available-for-sale, gross unrealized gains | 0 |  | 1,000 |  |  |
Available-for-sale, gross unrealized losses | (7,815,000) |  | (7,635,000) |  |  |
Available-for-sale, fair value | 64,080,000 |  | 80,014,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Corporate debt securities |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Available-for-sale, amortized cost | 10,084,000 |  | 8,928,000 |  |  |
Available-for-sale, gross unrealized gains | 0 |  | 0 |  |  |
Available-for-sale, gross unrealized losses | (1,132,000) |  | (756,000) |  |  |
Available-for-sale, fair value | 8,952,000 |  | 8,172,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Amortized Cost | 71,430,000 |  | 56,893,000 |  |  |
Held-to-maturity, gross unrealized gains | 373,000 |  | 380,000 |  |  |
Held-to-maturity, gross unrealized losses | (6,106,000) |  | (3,778,000) |  |  |
Debt securities held-to-maturity | 65,697,000 |  | 53,495,000 |  |  |
Allowance for Credit Losses | (868,000) |  | (1,059,000) |  |  |
Asset-backed securities |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Available-for-sale, amortized cost | 296,212,000 |  | 296,222,000 |  |  |
Available-for-sale, gross unrealized gains | 0 |  | 0 |  |  |
Available-for-sale, gross unrealized losses | (5,768,000) |  | (19,349,000) |  |  |
Available-for-sale, fair value | 290,444,000 |  | 276,873,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Agency residential |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 787,875,000 |  | 849,985,000 |  |  |
Held-to-maturity, gross unrealized gains | 3,000 |  | 795,000 |  |  |
Held-to-maturity, gross unrealized losses | (103,865,000) |  | (83,586,000) |  |  |
Debt securities held-to-maturity | 684,013,000 |  | 767,194,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Agency commercial |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Available-for-sale, amortized cost | 109,827,000 |  | 110,606,000 |  |  |
Available-for-sale, gross unrealized gains | 0 |  | 0 |  |  |
Available-for-sale, gross unrealized losses | (20,095,000) |  | (18,017,000) |  |  |
Available-for-sale, fair value | 89,732,000 |  | 92,589,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Amortized Cost | 83,322,000 |  | 32,127,000 |  |  |
Held-to-maturity, gross unrealized gains | 16,000 |  | 23,000 |  |  |
Held-to-maturity, gross unrealized losses | (6,392,000) |  | (1,189,000) |  |  |
Debt securities held-to-maturity | 76,946,000 |  | 30,961,000 |  |  |
Allowance for Credit Losses | (16,000) |  | 0 |  |  |
State, municipal, and sovereign debt obligations |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 228,779,000 |  | 260,249,000 |  |  |
Held-to-maturity, gross unrealized gains | 30,000 |  | 46,000 |  |  |
Held-to-maturity, gross unrealized losses | (26,705,000) |  | (24,940,000) |  |  |
Debt securities held-to-maturity | 202,104,000 |  | 235,355,000 |  |  |
Allowance for Credit Losses | (41,000) |  | (60,000) |  |  |
Non-agency commercial |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 20,760,000 |  | 25,310,000 |  |  |
Held-to-maturity, gross unrealized gains | 0 |  | 0 |  |  |
Held-to-maturity, gross unrealized losses | (2,178,000) |  | (2,274,000) |  |  |
Debt securities held-to-maturity | 18,582,000 |  | 23,036,000 |  |  |
Allowance for Credit Losses | (7,000) |  | (9,000) |  |  |
Total mortgage-backed securities |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 891,957,000 |  | 907,422,000 |  |  |
Held-to-maturity, gross unrealized gains | 19,000 |  | 818,000 |  |  |
Held-to-maturity, gross unrealized losses | (112,435,000) |  | (87,049,000) |  |  |
Debt securities held-to-maturity | 779,541,000 |  | 821,191,000 |  |  |
Allowance for Credit Losses | $ (23,000) |  | $ (9,000) |  |  |

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