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Securities - Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Available-for-sale, Less than 12 months, Estimated Fair Value | $ 450,977 | $ 444,596
Available-for-sale, Less than 12 months, Unrealized Losses | (17,928) | (2,894)
Available-for-sale, 12 months or Longer, Estimated Fair Value | 20,326 | 0
Available-for-sale, 12 months or longer, Unrealized Losses | (286) | 0
Available-for-sale, Total, Estimated Fair Value | 471,303 | 444,596
Available-for-sale, Total, Unrealized Losses | (18,214) | (2,894)
Held-to-maturity, Less than 12 months, Estimated Fair Value | 709,976 | 572,009
Held-to-maturity, Less than 12 months, Unrealized Losses | (37,533) | (8,309)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 225,238 | 55,402
Held-to-maturity, 12 months or longer, Unrealized Losses | (16,989) | (1,462)
Held-to-maturity, Total, Estimated Fair Value | 935,215 | 627,411
Held-to-maturity, total, unrealized losses | (54,522) | (9,771)
Total securities, Less than 12 months, Estimated Fair Value | 1,160,953 | 1,016,605
Total securities, Less than 12 months, Unrealized Losses | (55,461) | (11,203)
Total securities, 12 months or longer, Estimated Fair Value | 245,564 | 55,402
Total securities, 12 months or longer, Unrealized Losses | (17,275) | (1,462)
Total securities, Estimated Fair Value | 1,406,518 | 1,072,007
Total securities, Unrealized Losses | (72,736) | (12,665)
U.S. government and agency obligations | Investment securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Available-for-sale, Less than 12 months, Estimated Fair Value | 76,857 | 82,395
Available-for-sale, Less than 12 months, Unrealized Losses | (3,811) | (471)
Available-for-sale, 12 months or Longer, Estimated Fair Value | 5,017 | 0
Available-for-sale, 12 months or longer, Unrealized Losses | (44) | 0
Available-for-sale, Total, Estimated Fair Value | 81,874 | 82,395
Available-for-sale, Total, Unrealized Losses | (3,855) | (471)
Corporate debt securities | Investment securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Available-for-sale, Less than 12 months, Estimated Fair Value | 4,784 | 1,989
Available-for-sale, Less than 12 months, Unrealized Losses | (216) | (11)
Available-for-sale, 12 months or Longer, Estimated Fair Value | 0 | 0
Available-for-sale, 12 months or longer, Unrealized Losses | 0 | 0
Available-for-sale, Total, Estimated Fair Value | 4,784 | 1,989
Available-for-sale, Total, Unrealized Losses | (216) | (11)
Held-to-maturity, Less than 12 months, Estimated Fair Value | 6,080 | 38,304
Held-to-maturity, Less than 12 months, Unrealized Losses | (87) | (1,279)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 36,467 | 0
Held-to-maturity, 12 months or longer, Unrealized Losses | (1,864) | 0
Held-to-maturity, Total, Estimated Fair Value | 42,547 | 38,304
Held-to-maturity, total, unrealized losses | (1,951) | (1,279)
Asset-backed securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Available-for-sale, Less than 12 months, Unrealized Losses | (5,058) |
Available-for-sale, 12 months or Longer, Estimated Fair Value | 15,309 |
Available-for-sale, 12 months or longer, Unrealized Losses | (242) |
Available-for-sale, Total, Estimated Fair Value | 282,089 |
Available-for-sale, Total, Unrealized Losses | (5,300) |
Asset-backed securities | Investment securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Available-for-sale, Less than 12 months, Estimated Fair Value | 266,780 | 279,486
Available-for-sale, Less than 12 months, Unrealized Losses |  | (1,489)
Available-for-sale, 12 months or Longer, Estimated Fair Value |  | 0
Available-for-sale, 12 months or longer, Unrealized Losses |  | 0
Available-for-sale, Total, Estimated Fair Value |  | 279,486
Available-for-sale, Total, Unrealized Losses |  | (1,489)
Mortgage-backed securities: |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 500,533 | 458,376
Held-to-maturity, Less than 12 months, Unrealized Losses | (25,965) | (5,967)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 173,263 | 51,019
Held-to-maturity, 12 months or longer, Unrealized Losses | (13,933) | (1,361)
Held-to-maturity, Total, Estimated Fair Value | 673,797 | 509,395
Held-to-maturity, total, unrealized losses | (39,898) | (7,328)
Mortgage-backed securities: | Investment securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Available-for-sale, Less than 12 months, Estimated Fair Value | 102,556 | 80,726
Available-for-sale, Less than 12 months, Unrealized Losses | (8,843) | (923)
Available-for-sale, 12 months or Longer, Estimated Fair Value | 0 | 0
Available-for-sale, 12 months or longer, Unrealized Losses | 0 | 0
Available-for-sale, Total, Estimated Fair Value | 102,556 | 80,726
Available-for-sale, Total, Unrealized Losses | (8,843) | (923)
Mortgage-backed securities: | Agency residential |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 469,893 | 445,399
Held-to-maturity, Less than 12 months, Unrealized Losses | (24,938) | (5,822)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 170,870 | 50,133
Held-to-maturity, 12 months or longer, Unrealized Losses | (13,890) | (1,358)
Held-to-maturity, Total, Estimated Fair Value | 640,764 | 495,532
Held-to-maturity, total, unrealized losses | (38,828) | (7,180)
Mortgage-backed securities: | Agency commercial |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 608 | 2,255
Held-to-maturity, Less than 12 months, Unrealized Losses | (2) | (41)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 2,393 | 886
Held-to-maturity, 12 months or longer, Unrealized Losses | (43) | (3)
Held-to-maturity, Total, Estimated Fair Value | 3,001 | 3,141
Held-to-maturity, total, unrealized losses | (45) | (44)
Mortgage-backed securities: | Non-agency commercial |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 30,032 | 10,722
Held-to-maturity, Less than 12 months, Unrealized Losses | (1,025) | (104)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 0 | 0
Held-to-maturity, 12 months or longer, Unrealized Losses | 0 | 0
Held-to-maturity, Total, Estimated Fair Value | 30,032 | 10,722
Held-to-maturity, total, unrealized losses | (1,025) | (104)
State, municipal and sovereign debt obligations | Investment securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 203,363 | 75,329
Held-to-maturity, Less than 12 months, Unrealized Losses | (11,481) | (1,063)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 15,508 | 4,383
Held-to-maturity, 12 months or longer, Unrealized Losses | (1,192) | (101)
Held-to-maturity, Total, Estimated Fair Value | 218,871 | 79,712
Held-to-maturity, total, unrealized losses | $ (12,673) | $ (1,164)

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