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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Statement [Line Items] |  |
Amortized Cost | $ 2,947,500 |
Gross Unrealized Gains | 119,921 |
Gross Unrealized Losses | (5,278) |
Estimated Fair Value | 3,062,143 | $ 2,497,537
Amortized Cost, Held to Maturity | 278,281 | 369,841
Gross Unrealized Gains, Held to Maturity | 18,576 |
Gross Unrealized Losses, Held to Maturity | 0 |
HTM securities | 296,857 |
State and municipal securities |  |
Statement [Line Items] |  |
Amortized Cost | 891,327 |
Gross Unrealized Gains | 61,286 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 952,613 |
Amortized Cost, Held to Maturity |  | 369,841
Gross Unrealized Gains, Held to Maturity |  | 13,864
Gross Unrealized Losses, Held to Maturity |  | 0
HTM securities |  | 383,705
Amortized Cost |  | 638,125
Gross Unrealized Gains |  | 15,826
Gross Unrealized Losses |  | (1,024)
Estimated Fair Value |  | 652,927
Corporate debt securities |  |
Statement [Line Items] |  |
Amortized Cost | 348,391 |
Gross Unrealized Gains | 19,445 |
Gross Unrealized Losses | (691) |
Estimated Fair Value | 367,145 |
Amortized Cost |  | 370,401
Gross Unrealized Gains |  | 8,490
Gross Unrealized Losses |  | (1,534)
Estimated Fair Value |  | 377,357
Collateralized mortgage obligations |  |
Statement [Line Items] |  |
Amortized Cost | 491,321 |
Gross Unrealized Gains | 12,560 |
Gross Unrealized Losses | (115) |
Estimated Fair Value | 503,766 |
Amortized Cost |  | 682,307
Gross Unrealized Gains |  | 11,726
Gross Unrealized Losses |  | (315)
Estimated Fair Value |  | 693,718
Residential mortgage-backed securities |  |
Statement [Line Items] |  |
Amortized Cost | 373,779 |
Gross Unrealized Gains | 4,246 |
Gross Unrealized Losses | (27) |
Estimated Fair Value | 377,998 |
Amortized Cost, Held to Maturity | 278,281 | 369,841
Gross Unrealized Gains, Held to Maturity | 18,576 | 13,864
Gross Unrealized Losses, Held to Maturity | 0 | 0
HTM securities | 296,857 | 383,705
Amortized Cost |  | 177,183
Gross Unrealized Gains |  | 1,078
Gross Unrealized Losses |  | (949)
Estimated Fair Value |  | 177,312
Commercial mortgage-backed securities |  |
Statement [Line Items] |  |
Amortized Cost | 741,172 |
Gross Unrealized Gains | 22,384 |
Gross Unrealized Losses | (1,141) |
Estimated Fair Value | 762,415 |
Amortized Cost |  | 489,603
Gross Unrealized Gains |  | 6,471
Gross Unrealized Losses |  | (1,777)
Estimated Fair Value |  | 494,297
Auction rate securities |  |
Statement [Line Items] |  |
Amortized Cost | 101,510 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (3,304) |
Estimated Fair Value | $ 98,206 |
Amortized Cost |  | 107,410
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (5,484)
Estimated Fair Value |  | 101,926
Debt securities |  |
Statement [Line Items] |  |
Amortized Cost |  | 2,465,029
Gross Unrealized Gains |  | 43,591
Gross Unrealized Losses |  | (11,083)
Estimated Fair Value |  | $ 2,497,537

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