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Nature of Operations and Summary of Significant Accounting Policies - Fair Value of Securities Correction (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available for sale |  |
Amortized Cost | $ 1,137,702 | $ 1,153,611
Gross Unrealized Gains | 335 | 16,800
Gross Unrealized Losses | (140,479) | (9,599)
Fair Value | 997,558 | 1,160,812
Held to maturity |  |
Investment securities, held to maturity | 2,022,748 | 1,552,443
Gross Unrealized Gains | 374 | 20,954
Gross Unrealized Losses | (341,813) | (13,406)
Fair Value | 1,681,309 | 1,559,991
Federal agency mortgage–backed pools |  |
Available for sale |  |
Amortized Cost | 220,963 | 257,185
Gross Unrealized Gains | 0 | 1,914
Gross Unrealized Losses | (30,307) | (1,408)
Fair Value | 190,656 | 257,691
Held to maturity |  |
Investment securities, held to maturity | 343,953 | 247,937
Gross Unrealized Gains | 0 | 209
Gross Unrealized Losses | (56,714) | (4,010)
Fair Value | 287,239 | 244,136
Private labeled mortgage–backed pools |  |
Available for sale |  |
Amortized Cost |  | 0
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 0
Held to maturity |  |
Investment securities, held to maturity | 35,466 | 40,447
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5,493) | (442)
Fair Value | $ 29,973 | 40,005
Total held to maturity investment securities |  |
Available for sale |  |
Amortized Cost |  | 257,185
Gross Unrealized Gains |  | 1,914
Gross Unrealized Losses |  | (1,408)
Fair Value |  | 257,691
Held to maturity |  |
Investment securities, held to maturity |  | 288,384
Gross Unrealized Gains |  | 209
Gross Unrealized Losses |  | (4,452)
Fair Value |  | 284,141
As Reported | Federal agency mortgage–backed pools |  |
Available for sale |  |
Amortized Cost |  | 225,329
Gross Unrealized Gains |  | 1,777
Gross Unrealized Losses |  | (1,032)
Fair Value |  | 226,074
Held to maturity |  |
Investment securities, held to maturity |  | 188,426
Gross Unrealized Gains |  | 151
Gross Unrealized Losses |  | (2,612)
Fair Value |  | 185,965
As Reported | Private labeled mortgage–backed pools |  |
Available for sale |  |
Amortized Cost |  | 31,856
Gross Unrealized Gains |  | 137
Gross Unrealized Losses |  | (376)
Fair Value |  | 31,617
Held to maturity |  |
Investment securities, held to maturity |  | 99,958
Gross Unrealized Gains |  | 58
Gross Unrealized Losses |  | (1,840)
Fair Value |  | 98,176
As Reported | Total held to maturity investment securities |  |
Available for sale |  |
Amortized Cost |  | 257,185
Gross Unrealized Gains |  | 1,914
Gross Unrealized Losses |  | (1,408)
Fair Value |  | 257,691
Held to maturity |  |
Investment securities, held to maturity |  | 288,384
Gross Unrealized Gains |  | 209
Gross Unrealized Losses |  | (4,452)
Fair Value |  | 284,141
Adjustment | Federal agency mortgage–backed pools |  |
Available for sale |  |
Amortized Cost |  | 31,856
Gross Unrealized Gains |  | 137
Gross Unrealized Losses |  | (376)
Fair Value |  | 31,617
Held to maturity |  |
Investment securities, held to maturity |  | 59,511
Gross Unrealized Gains |  | 58
Gross Unrealized Losses |  | (1,398)
Fair Value |  | 58,171
Adjustment | Private labeled mortgage–backed pools |  |
Available for sale |  |
Amortized Cost |  | (31,856)
Gross Unrealized Gains |  | (137)
Gross Unrealized Losses |  | 376
Fair Value |  | (31,617)
Held to maturity |  |
Investment securities, held to maturity |  | (59,511)
Gross Unrealized Gains |  | (58)
Gross Unrealized Losses |  | 1,398
Fair Value |  | $ (58,171)

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