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Loans and Allowance for Credit Losses - Schedule of Allowance for Credit Losses and Amortized Cost Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Allowance for loan losses: |  |  |  |  |  |  |  |
Total allowance for loan losses | $ 131,388 | [1] |  | $ 54,619 | [1] |  | $ 55,461 | $ 50,381
Loans and leases outstanding: |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 104,767 |  |  |  |
Collectively evaluated for impairment |  |  |  | 11,978,895 |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Balance |  |  |  | 33,862 |  |  |  |
Total loans | 13,786,479 |  |  | 12,117,524 |  |  |  |
Previously Reported |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 8,897 |  |  |  |
Collectively evaluated for impairment |  |  |  | 45,527 |  |  |  |
Allowance for loan losses, Loans acquired with deteriorated credit quality |  |  |  | 195 |  |  |  |
Total allowance for loan losses |  |  | $ 54,619 | 54,619 |  | $ 54,619 | 55,461 |
Loans and leases outstanding: |  |  |  |  |  |  |  |
Total loans |  |  | 12,117,524 | 12,117,524 |  | 12,117,524 |  |
Commercial |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Total allowance for loan losses | 30,567 |  |  | 21,359 |  |  | 21,742 | 19,246
Loans and leases outstanding: |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 41,479 |  |  |  |
Collectively evaluated for impairment |  |  |  | 2,843,536 |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Balance |  |  |  | 5,281 |  |  |  |
Total loans | 3,956,422 |  |  | 2,890,296 |  |  |  |
Commercial | Previously Reported |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 7,891 |  |  |  |
Collectively evaluated for impairment |  |  |  | 14,692 |  |  |  |
Allowance for loan losses, Loans acquired with deteriorated credit quality |  |  |  | 2 |  |  |  |
Total allowance for loan losses |  |  | 21,359 | 22,585 |  | 21,359 | 21,742 |
Loans and leases outstanding: |  |  |  |  |  |  |  |
Total loans |  |  | 2,815,154 | 2,890,296 |  | 2,815,154 |  |
Commercial real estate |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Total allowance for loan losses | 75,810 |  |  | 20,535 |  |  | 23,470 | 21,436
Loans and leases outstanding: |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 63,288 |  |  |  |
Collectively evaluated for impairment |  |  |  | 5,084,737 |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Balance |  |  |  | 18,767 |  |  |  |
Total loans | 5,946,512 |  |  | 5,166,792 |  |  |  |
Commercial real estate | Previously Reported |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 1,006 |  |  |  |
Collectively evaluated for impairment |  |  |  | 20,582 |  |  |  |
Allowance for loan losses, Loans acquired with deteriorated credit quality |  |  |  | 0 |  |  |  |
Total allowance for loan losses |  |  | 20,535 | 21,588 |  | 20,535 | 23,470 |
Loans and leases outstanding: |  |  |  |  |  |  |  |
Total loans |  |  | 4,889,253 | 5,166,792 |  | 4,889,253 |  |
Residential real estate |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Total allowance for loan losses | 12,608 |  |  | 2,299 |  |  | 2,277 | 1,763
Loans and leases outstanding: |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 |  |  |  |
Collectively evaluated for impairment |  |  |  | 2,326,907 |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Balance |  |  |  | 7,382 |  |  |  |
Total loans | 2,248,422 |  |  | 2,334,289 |  |  |  |
Residential real estate | Previously Reported |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 |  |  |  |
Collectively evaluated for impairment |  |  |  | 2,299 |  |  |  |
Allowance for loan losses, Loans acquired with deteriorated credit quality |  |  |  | 0 |  |  |  |
Total allowance for loan losses |  |  | 2,299 | 2,299 |  | 2,299 | 2,277 |
Loans and leases outstanding: |  |  |  |  |  |  |  |
Total loans |  |  | $ 2,334,289 | 2,334,289 |  | $ 2,334,289 |  |
Consumer |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Total allowance for loan losses |  |  |  |  |  |  | 7,972 | $ 7,936
Loans and leases outstanding: |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 |  |  |  |
Collectively evaluated for impairment |  |  |  | 1,723,715 |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Outstanding Balance |  |  |  | 2,432 |  |  |  |
Total loans | $ 1,635,123 |  |  | 1,726,147 |  |  |  |
Consumer | Previously Reported |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 |  |  |  |
Collectively evaluated for impairment |  |  |  | 7,954 |  |  |  |
Allowance for loan losses, Loans acquired with deteriorated credit quality |  |  |  | 193 |  |  |  |
Total allowance for loan losses |  |  |  | 8,147 |  |  | $ 7,972 |
Loans and leases outstanding: |  |  |  |  |  |  |  |
Total loans |  |  |  | $ 1,726,147 |  |  |  |
[1] | Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.

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