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Securities (Reconciliation of fair value of available for sale securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | $ 1,605,913 | $ 1,583,736
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 55 | 8,808
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (180,457) | (21,396)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 1,425,511 | 1,571,148
U.S. government agency securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 231,122 | 217,393
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 990
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (31,180) | (2,901)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 199,942 | 215,482
U.S. treasury securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 873,891 | 873,467
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 172
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (89,433) | (12,191)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 784,458 | 861,448
Agency mortgage-backed securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 393,296 | 364,955
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 50 | 4,512
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (49,193) | (5,534)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 344,153 | 363,933
Agency Collateralized Mortgage Obligations [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 43,672 | 78,966
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5 | 1,282
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,890) | (571)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 40,787 | 79,677
US States and Political Subdivisions Debt Securities [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 193 | 192
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 11
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (6) | 0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 187 | 203
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 489 | 489
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 489 | 491
Pooled trust preferred securities issued by banks and insurers |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 1,202 | 1,199
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (203) | (199)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 999 | 1,000
Small Business Administration Pooled Securities [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 62,048 | 47,075
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 1,839
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (7,552) | 0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 54,496 | $ 48,914

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