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Allowance for Credit Losses (Summary of Allowance for Credit Losses) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020
Receivables [Abstract] |  |  |  |
Financing receivable, allowance for credit loss, expected, COVID-19 | $ 0 |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 224,314,000 | $ 225,141,000 | $ 223,712,000 |
Provisions | (36,835,000) | 58,352,000 | 31,441,000 |
Initial PCD allowance |  | 1,193,000 |  |
Charge-offs | (35,422,000) | (45,105,000) | (43,027,000) |
Recoveries | 26,436,000 | 22,657,000 | 13,015,000 |
Ending balance | 178,493,000 | 224,314,000 | 225,141,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss | 178,493,000 | $ 224,314,000 | 225,141,000 |
Allowance for credit loss, forecast period |  | 2 years |  |
PCD Loans |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 23,987,000 | $ 7,536,000 | 9,144,000 |
Provisions | (14,329,000) | (7,202,000) | (1,608,000) |
Initial PCD allowance |  | 1,193,000 |  |
Charge-offs | (2,317,000) | (3,300,000) | 0 |
Recoveries | 7,461,000 | 6,759,000 | 0 |
Ending balance | 14,802,000 | 23,987,000 | 7,536,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss | 14,802,000 | 23,987,000 | 7,536,000 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance |  | (37,924,000) |  |
Ending balance |  |  | (37,924,000) |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss |  |  | (37,924,000) | $ 37,900,000
Cumulative Effect, Period of Adoption, Adjustment | Financial Asset Acquired and No Credit Deterioration |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss |  |  |  | 56,900,000
Cumulative Effect, Period of Adoption, Adjustment | PCD Loans |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance |  | 19,001,000 |  |
Ending balance |  |  | 19,001,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss |  |  | 19,001,000 | $ 19,000,000
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance |  | 187,217,000 |  |
Ending balance |  |  | 187,217,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss |  |  | 187,217,000 |
Cumulative Effect, Period of Adoption, Adjusted Balance | PCD Loans |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance |  | 26,537,000 |  |
Ending balance |  |  | 26,537,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss |  |  | 26,537,000 |
Commercial |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 80,842,000 | 142,369,000 | 139,043,000 |
Provisions | (1,228,000) | 37,763,000 | 13,386,000 |
Initial PCD allowance |  | 0 |  |
Charge-offs | (15,924,000) | (17,586,000) | (14,744,000) |
Recoveries | 7,523,000 | 5,850,000 | 4,684,000 |
Ending balance | 71,213,000 | 80,842,000 | 142,369,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss | 71,213,000 | 80,842,000 | 142,369,000 |
Commercial | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance |  | (87,554,000) |  |
Ending balance |  |  | (87,554,000) |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss |  |  | (87,554,000) |
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance |  | 54,815,000 |  |
Ending balance |  |  | 54,815,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss |  |  | 54,815,000 |
Consumer Portfolio Segment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 119,485,000 | 75,236,000 | 75,525,000 |
Provisions | (21,278,000) | 27,791,000 | 19,663,000 |
Initial PCD allowance |  | 0 |  |
Charge-offs | (17,181,000) | (24,219,000) | (28,283,000) |
Recoveries | 11,452,000 | 10,048,000 | 8,331,000 |
Ending balance | 92,478,000 | 119,485,000 | 75,236,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss | 92,478,000 | 119,485,000 | 75,236,000 |
Consumer Portfolio Segment | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance |  | 30,629,000 |  |
Ending balance |  |  | 30,629,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss |  |  | 30,629,000 |
Consumer Portfolio Segment | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance |  | 105,865,000 |  |
Ending balance |  |  | 105,865,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss |  |  | 105,865,000 |
Unfunded Loan Commitment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 12,814,000 | 1,055,000 |  |
Provisions | (999,000) | 2,874,000 |  |
Ending balance | 11,815,000 | 12,814,000 | 1,055,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss | 11,815,000 | 12,814,000 | 1,055,000 |
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 0 | 8,885,000 |  |
Ending balance |  | 0 | 8,885,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss |  | 0 | 8,885,000 |
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | $ 12,814,000 | 9,940,000 |  |
Ending balance |  | 12,814,000 | 9,940,000 |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |
Increase (decrease) in allowance for credit loss |  | $ 12,814,000 | $ 9,940,000 |

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
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