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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | $ 313,575 |  | $ 180,154 |  |  |
Available-for-sale, gross unrealized gains | 1,714 |  | 3,154 |  |  |
Available-for-sale, gross unrealized losses | (669) |  | (6) |  |  |
Debt securities available-for-sale, at estimated fair value | 314,620 |  | 183,302 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Amortized Cost | 1,129,719 |  | 942,314 |  |  |
Held-to-maturity, gross unrealized gains | 20,490 |  | 29,378 |  |  |
Held-to-maturity, gross unrealized losses | (6,828) |  | (3,226) |  |  |
Securities held-to-maturity, estimated fair value | 1,143,381 |  | 968,466 |  |  |
Allowance for Credit Losses | (1,503) | $ (1,609) | (1,715) | $ (2,393) | $ (2,446) | $ 0
Total, amortized cost | 1,443,294 |  | 1,122,468 |  |  |
Total, gross unrealized gains | 22,204 |  | 32,532 |  |  |
Total, gross unrealized losses | (7,497) |  | (3,232) |  |  |
Total, estimated fair value | 1,458,001 |  | 1,151,768 |  |  |
U.S. government and agency obligations | Securities Investment |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 133,088 |  | 173,790 |  |  |
Available-for-sale, gross unrealized gains | 1,653 |  | 3,152 |  |  |
Available-for-sale, gross unrealized losses | (136) |  | (2) |  |  |
Debt securities available-for-sale, at estimated fair value | 134,605 |  | 176,940 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Corporate debt securities | Securities Investment |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 5,000 |  |  |  |  |
Available-for-sale, gross unrealized gains | 52 |  |  |  |  |
Available-for-sale, gross unrealized losses | (3) |  |  |  |  |
Debt securities available-for-sale, at estimated fair value | 5,049 |  |  |  |  |
Allowance for Credit Losses | 0 |  |  |  |  |
Amortized Cost | 70,343 |  | 72,305 |  |  |
Held-to-maturity, gross unrealized gains | 1,828 |  | 1,615 |  |  |
Held-to-maturity, gross unrealized losses | (1,273) |  | (2,652) |  |  |
Securities held-to-maturity, estimated fair value | 70,898 |  | 71,268 |  |  |
Allowance for Credit Losses | (1,309) |  | (1,550) |  |  |
Collateralized loan obligations (“CLOs”) | Securities Investment |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 145,792 |  | 6,174 |  |  |
Available-for-sale, gross unrealized gains | 8 |  | 0 |  |  |
Available-for-sale, gross unrealized losses | (380) |  | (4) |  |  |
Debt securities available-for-sale, at estimated fair value | 145,420 |  | 6,170 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
State, municipal and sovereign debt obligations | Securities Investment |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 292,226 |  | 238,405 |  |  |
Held-to-maturity, gross unrealized gains | 8,379 |  | 11,500 |  |  |
Held-to-maturity, gross unrealized losses | (630) |  | (231) |  |  |
Securities held-to-maturity, estimated fair value | 299,975 |  | 249,674 |  |  |
Allowance for Credit Losses | (86) |  | (48) |  |  |
Mortgage-backed securities: |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 767,150 |  | 631,604 |  |  |
Held-to-maturity, gross unrealized gains | 10,283 |  | 16,263 |  |  |
Held-to-maturity, gross unrealized losses | (4,925) |  | (343) |  |  |
Securities held-to-maturity, estimated fair value | 772,508 |  | 647,524 |  |  |
Allowance for Credit Losses | (108) |  | (117) |  |  |
Mortgage-backed securities: | FHLMC |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 359,449 |  | 232,942 |  |  |
Held-to-maturity, gross unrealized gains | 3,568 |  | 5,383 |  |  |
Held-to-maturity, gross unrealized losses | (2,881) |  | (124) |  |  |
Securities held-to-maturity, estimated fair value | 360,136 |  | 238,201 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Mortgage-backed securities: | FNMA |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 12,648 |  | 190 |  |  |
Available-for-sale, gross unrealized gains | 1 |  | 2 |  |  |
Available-for-sale, gross unrealized losses | 0 |  | 0 |  |  |
Debt securities available-for-sale, at estimated fair value | 12,649 |  | 192 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Amortized Cost | 326,877 |  | 293,615 |  |  |
Held-to-maturity, gross unrealized gains | 4,887 |  | 7,640 |  |  |
Held-to-maturity, gross unrealized losses | (1,964) |  | (147) |  |  |
Securities held-to-maturity, estimated fair value | 329,800 |  | 301,108 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Mortgage-backed securities: | GNMA |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 44,010 |  | 67,334 |  |  |
Held-to-maturity, gross unrealized gains | 1,056 |  | 2,014 |  |  |
Held-to-maturity, gross unrealized losses | (34) |  | (12) |  |  |
Securities held-to-maturity, estimated fair value | 45,032 |  | 69,336 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Mortgage-backed securities: | SBA |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 4,654 |  | 5,392 |  |  |
Held-to-maturity, gross unrealized gains | 12 |  | 0 |  |  |
Held-to-maturity, gross unrealized losses | (43) |  | (60) |  |  |
Securities held-to-maturity, estimated fair value | 4,623 |  | 5,332 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Mortgage-backed securities: | Other |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 32,160 |  | 32,321 |  |  |
Held-to-maturity, gross unrealized gains | 760 |  | 1,226 |  |  |
Held-to-maturity, gross unrealized losses | (3) |  | 0 |  |  |
Securities held-to-maturity, estimated fair value | 32,917 |  | 33,547 |  |  |
Allowance for Credit Losses | (108) |  | $ (117) |  |  |
Mortgage-backed securities - agency commercial |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Amortized Cost | 17,047 |  |  |  |  |
Available-for-sale, gross unrealized gains | 0 |  |  |  |  |
Available-for-sale, gross unrealized losses | (150) |  |  |  |  |
Debt securities available-for-sale, at estimated fair value | 16,897 |  |  |  |  |
Allowance for Credit Losses | $ 0 |  |  |  |  |

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