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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Available-for-sale, amortized cost | $ 265,891 | $ 180,154
Available-for-sale, gross unrealized gains | 2,668 | 3,154
Available-for-sale, gross unrealized losses | (48) | (6)
Available-for-sale, estimated fair value | 268,511 | 183,302
Allowance for Credit Losses | 0 | 0
Held-to-maturity, amortized cost | 1,087,209 | 942,314
Held-to-maturity, gross unrealized gains | 21,294 | 29,378
Held-to-maturity, gross unrealized losses | (8,758) | (3,226)
Securities held-to-maturity, net encumbered | 1,099,745 | 968,466
Allowance for Credit Losses | (1,717) | (1,715)
Total, amortized cost | 1,353,100 | 1,122,468
Total, gross unrealized gains | 23,962 | 32,532
Total, gross unrealized losses | (8,806) | (3,232)
Total, estimated fair value | 1,368,256 | 1,151,768
Other |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, amortized cost | 32,269 |
U.S. government and agency obligations | Securities investment |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, amortized cost | 169,337 | 173,790
Available-for-sale, gross unrealized gains | 2,570 | 3,152
Available-for-sale, gross unrealized losses | (8) | (2)
Available-for-sale, estimated fair value | 171,899 | 176,940
Allowance for Credit Losses | 0 | 0
Collateralized loan obligations (“CLOs”) | Securities investment |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, amortized cost | 96,410 | 6,174
Available-for-sale, gross unrealized gains | 96 | 0
Available-for-sale, gross unrealized losses | (40) | (4)
Available-for-sale, estimated fair value | 96,466 | 6,170
Allowance for Credit Losses | 0 | 0
State, municipal and sovereign debt obligations | Securities investment |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, amortized cost | 278,179 | 238,405
Held-to-maturity, gross unrealized gains | 7,043 | 11,500
Held-to-maturity, gross unrealized losses | (1,106) | (231)
Securities held-to-maturity, net encumbered | 284,116 | 249,674
Allowance for Credit Losses | (90) | (48)
Corporate debt securities | Securities investment |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, amortized cost | 72,821 | 72,305
Held-to-maturity, gross unrealized gains | 1,542 | 1,615
Held-to-maturity, gross unrealized losses | (1,912) | (2,652)
Securities held-to-maturity, net encumbered | 72,451 | 71,268
Allowance for Credit Losses | (1,511) | (1,550)
Mortgage-backed securities - FNMA |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, amortized cost | 736,209 | 631,604
Held-to-maturity, gross unrealized gains | 12,709 | 16,263
Held-to-maturity, gross unrealized losses | (5,740) | (343)
Securities held-to-maturity, net encumbered | 743,178 | 647,524
Allowance for Credit Losses | (116) | (117)
Mortgage-backed securities - FNMA | FHLMC |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, amortized cost | 303,539 | 232,942
Held-to-maturity, gross unrealized gains | 4,256 | 5,383
Held-to-maturity, gross unrealized losses | (3,178) | (124)
Securities held-to-maturity, net encumbered | 304,617 | 238,201
Allowance for Credit Losses | 0 |
Mortgage-backed securities - FNMA | FNMA |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, amortized cost | 144 | 190
Available-for-sale, gross unrealized gains | 2 | 2
Available-for-sale, gross unrealized losses | 0 | 0
Available-for-sale, estimated fair value | 146 | 192
Allowance for Credit Losses | 0 | 0
Held-to-maturity, amortized cost | 335,307 | 293,615
Held-to-maturity, gross unrealized gains | 5,978 | 7,640
Held-to-maturity, gross unrealized losses | (2,481) | (147)
Securities held-to-maturity, net encumbered | 338,804 | 301,108
Allowance for Credit Losses | 0 |
Mortgage-backed securities - FNMA | GNMA |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, amortized cost | 59,904 | 67,334
Held-to-maturity, gross unrealized gains | 1,614 | 2,014
Held-to-maturity, gross unrealized losses | (23) | (12)
Securities held-to-maturity, net encumbered | 61,495 | 69,336
Allowance for Credit Losses | 0 |
Mortgage-backed securities - FNMA | SBA |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, amortized cost | 5,190 | 5,392
Held-to-maturity, gross unrealized gains | 0 | 0
Held-to-maturity, gross unrealized losses | (58) | (60)
Securities held-to-maturity, net encumbered | 5,132 | 5,332
Allowance for Credit Losses | 0 |
Mortgage-backed securities - FNMA | Other |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, amortized cost | 32,269 | 32,321
Held-to-maturity, gross unrealized gains | 861 | 1,226
Held-to-maturity, gross unrealized losses | 0 | 0
Securities held-to-maturity, net encumbered | 33,130 | 33,547
Allowance for Credit Losses | $ (116) | $ (117)

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