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Basis of Presentation and Significant Accounting Policies - Schedule of Composition of Loans and Impact of Adoption (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |  |  |
Total loans | $ 13,786,479 |  |  | $ 12,117,524 |  |  |  |
Allowance | (131,388) | [1] |  | (54,619) | [1] |  | $ (55,461) | $ (50,381)
Net loans | 13,655,091 |  |  | 12,062,905 |  |  |  |
Shareholders' equity: |  |  |  |  |  |  |  |
Retained earnings | 783,892 |  |  | 682,185 |  |  |  |
Previously Reported |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  | $ 12,117,524 | 12,117,524 |  | $ 12,117,524 |  |
Allowance |  |  | (54,619) | (54,619) |  | (54,619) | (55,461) |
Net loans |  |  | 12,062,905 |  |  |  |  |
Net deferred tax assets |  |  | 29,705 |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Allowance for credit losses on unfunded loan commitments |  |  | 2,656 |  |  |  |  |
Shareholders' equity: |  |  |  |  |  |  |  |
Retained earnings |  |  | 682,185 |  |  |  |  |
Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  | 4,478 |  |  |  |  |
Allowance |  |  | (41,347) | (41,347) |  |  |  |
Net loans |  |  | (36,869) |  |  |  |  |
Net deferred tax assets |  |  | 10,268 |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Allowance for credit losses on unfunded loan commitments |  |  | 4,549 |  |  |  |  |
Shareholders' equity: |  |  |  |  |  |  |  |
Retained earnings |  |  | (31,150) |  |  |  |  |
Adjusted Balance |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 13,786,479 |  | 12,122,002 |  |  |  |  |
Allowance | (131,388) |  | (95,966) | (95,966) |  |  |  |
Net loans | 13,655,091 |  | 12,026,036 |  |  |  |  |
Net deferred tax assets |  |  | 39,973 |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Allowance for credit losses on unfunded loan commitments |  |  | 7,205 |  |  |  |  |
Shareholders' equity: |  |  |  |  |  |  |  |
Retained earnings |  |  | 651,035 |  |  |  |  |
Commercial |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 3,956,422 |  |  | 2,890,296 |  |  |  |
Allowance | (30,567) |  |  | (21,359) |  |  | (21,742) | (19,246)
Commercial | Previously Reported |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  | 2,815,154 | 2,890,296 |  | 2,815,154 |  |
Allowance |  |  | (21,359) | (22,585) |  | (21,359) | (21,742) |
Commercial | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  |  |  |  | (75,142) |  |
Allowance |  |  |  |  |  | 1,226 |  |
Commercial | Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | (198,722) |  | 2,679 |  |  |  |  |
Allowance |  |  | (7,150) | (7,150) |  |  |  |
Commercial | Adjusted Balance |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 3,757,700 |  | 2,817,833 |  |  |  |  |
Allowance |  |  | (28,509) | (28,509) |  |  |  |
Commercial real estate |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 5,946,512 |  |  | 5,166,792 |  |  |  |
Allowance | (75,810) |  |  | (20,535) |  |  | (23,470) | (21,436)
Commercial real estate | Previously Reported |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  | 4,889,253 | 5,166,792 |  | 4,889,253 |  |
Allowance |  |  | (20,535) | (21,588) |  | (20,535) | (23,470) |
Commercial real estate | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  |  |  |  | (277,539) |  |
Allowance |  |  |  |  |  | 1,053 |  |
Commercial real estate | Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | (171,701) |  | 1,637 |  |  |  |  |
Allowance |  |  | (25,548) | (25,548) |  |  |  |
Commercial real estate | Adjusted Balance |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 5,774,811 |  | 4,890,890 |  |  |  |  |
Allowance |  |  | (46,083) | (46,083) |  |  |  |
BBCC |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Allowance | (6,120) |  |  | (2,279) |  |  |  |
BBCC | Previously Reported |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  | 352,681 |  |  | 352,681 |  |
Allowance |  |  | (2,279) |  |  | (2,279) |  |
BBCC | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  |  |  |  | 352,681 |  |
Allowance |  |  |  |  |  | (2,279) |  |
BBCC | Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 370,423 |  | 33 |  |  |  |  |
Allowance |  |  | (3,702) | (3,702) |  |  |  |
BBCC | Adjusted Balance |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 370,423 |  | 352,714 |  |  |  |  |
Allowance |  |  | (5,981) | (5,981) |  |  |  |
Residential real estate |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 2,248,422 |  |  | 2,334,289 |  |  |  |
Allowance | (12,608) |  |  | (2,299) |  |  | (2,277) | (1,763)
Residential real estate | Previously Reported |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  | 2,334,289 | 2,334,289 |  | 2,334,289 |  |
Allowance |  |  | (2,299) | (2,299) |  | (2,299) | (2,277) |
Residential real estate | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  |  |  |  | 0 |  |
Allowance |  |  |  |  |  | 0 |  |
Residential real estate | Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 0 |  | 105 |  |  |  |  |
Allowance |  |  | (6,986) | (6,986) |  |  |  |
Residential real estate | Adjusted Balance |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 2,248,422 |  | 2,334,394 |  |  |  |  |
Allowance |  |  | (9,285) | (9,285) |  |  |  |
Consumer credit, net of unearned income |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 1,635,123 |  |  | 1,726,147 |  |  |  |
Allowance |  |  |  |  |  |  | (7,972) | $ (7,936)
Consumer credit, net of unearned income | Previously Reported |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  |  | 1,726,147 |  |  |  |
Allowance |  |  |  | (8,147) |  |  | $ (7,972) |
Consumer credit, net of unearned income | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  |  |  |  | (1,726,147) |  |
Allowance |  |  |  |  |  | 8,147 |  |
Consumer credit, net of unearned income | Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | (1,635,123) |  |  |  |  |  |  |
Indirect |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 913,902 |  |  |  |  |  |  |
Allowance | (3,580) |  |  | (5,319) |  |  |  |
Indirect | Previously Reported |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  | 935,584 |  |  | 935,584 |  |
Allowance |  |  | (5,319) |  |  | (5,319) |  |
Indirect | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  |  |  |  | 935,584 |  |
Allowance |  |  |  |  |  | (5,319) |  |
Indirect | Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 913,902 |  | 10 |  |  |  |  |
Allowance |  |  | 1,669 | 1,669 |  |  |  |
Indirect | Adjusted Balance |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 913,902 |  | 935,594 |  |  |  |  |
Allowance |  |  | (3,650) | (3,650) |  |  |  |
Direct |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 164,807 |  |  |  |  |  |  |
Allowance | (855) |  |  | (1,863) |  |  |  |
Direct | Previously Reported |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  | 228,524 |  |  | 228,524 |  |
Allowance |  |  | (1,863) |  |  | (1,863) |  |
Direct | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  |  |  |  | 228,524 |  |
Allowance |  |  |  |  |  | (1,863) |  |
Direct | Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 164,807 |  | 2 |  |  |  |  |
Allowance |  |  | 1,059 | 1,059 |  |  |  |
Direct | Adjusted Balance |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 164,807 |  | 228,526 |  |  |  |  |
Allowance |  |  | (804) | (804) |  |  |  |
Home equity |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 556,414 |  |  |  |  |  |  |
Allowance | (1,848) |  |  | (965) |  |  |  |
Home equity | Previously Reported |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  | 562,039 |  |  | 562,039 |  |
Allowance |  |  | (965) |  |  | (965) |  |
Home equity | Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans |  |  |  |  |  | 562,039 |  |
Allowance |  |  |  |  |  | $ (965) |  |
Home equity | Adjustment |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | 556,414 |  | 12 |  |  |  |  |
Allowance |  |  | (689) | (689) |  |  |  |
Home equity | Adjusted Balance |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total loans | $ 556,414 |  | 562,051 |  |  |  |  |
Allowance |  |  | $ (1,654) | $ (1,654) |  |  |  |
[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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