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Loans and Allowance for Credit Losses - Details on Allowance for Loan Losses and Recorded Investment by Loan Classification and Impairment Evaluation Method (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  | $ 90,512 |  |  |
Individually evaluated for impairment |  |  |  | 3,280 |  |  |
Total allowance for loan losses |  | $ 288,645 | $ 285,372 | 94,777 | $ 93,647 | $ 90,253 | $ 83,575
Collectively evaluated for impairment |  |  |  | 19,708,817 |  |  |
Individually evaluated for impairment |  | 88,543 |  | 58,144 |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | 22,477,409 |  | 19,787,876 |  |  |
Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 59,785 |  |  |  |  |
Business Assets |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 28,692 |  |  |  |  |
Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 66 |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] |  |  | 0 |  |  |
Loans acquired with deteriorated credit quality |  |  |  | 20,915 |  |  |
Commercial real estate – mortgage |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  | 32,134 |  |  |
Individually evaluated for impairment |  |  |  | 1,235 |  |  |
Total allowance for loan losses |  |  |  | 33,369 |  |  |
Collectively evaluated for impairment |  |  |  | 7,681,608 |  |  |
Individually evaluated for impairment |  |  |  | 18,122 |  |  |
Loans and Leases Receivable, Net of Deferred Income |  |  |  | 7,709,218 |  |  |
Commercial real estate – mortgage | Loans acquired with deteriorated credit quality |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] |  |  | 0 |  |  |
Loans acquired with deteriorated credit quality |  |  |  | 9,488 |  |  |
Commercial real estate- owner occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses |  | 36,426 | 38,803 | 13,406 | 12,157 | 12,174 | 11,297
Individually evaluated for impairment |  | 14,955 |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | 2,748,075 |  | 2,669,766 |  |  |
Commercial real estate- owner occupied | Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 14,955 |  |  |  |  |
Commercial real estate- owner occupied | Business Assets |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 0 |  |  |  |  |
Commercial real estate- owner occupied | Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 0 |  |  |  |  |
Commercial real estate- Non-owner occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses |  | 69,859 | 68,426 | 19,963 | 20,460 | 18,652 | 15,649
Individually evaluated for impairment |  | 11,294 |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | 5,220,452 |  | 5,039,452 |  |  |
Commercial real estate- Non-owner occupied | Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 11,294 |  |  |  |  |
Commercial real estate- Non-owner occupied | Business Assets |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 0 |  |  |  |  |
Commercial real estate- Non-owner occupied | Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 0 |  |  |  |  |
Consumer real estate – mortgage |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  | 6,762 |  |  |
Individually evaluated for impairment |  |  |  | 1,292 |  |  |
Total allowance for loan losses |  | 31,949 | 29,358 | 8,054 | 7,770 | 8,489 | 7,670
Collectively evaluated for impairment |  |  |  | 3,036,922 |  |  |
Individually evaluated for impairment |  | 27,122 |  | 25,018 |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | 3,041,019 |  | 3,068,625 |  |  |
Consumer real estate – mortgage | Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 27,122 |  |  |  |  |
Consumer real estate – mortgage | Business Assets |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 0 |  |  |  |  |
Consumer real estate – mortgage | Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 0 |  |  |  |  |
Consumer real estate – mortgage | Loans acquired with deteriorated credit quality |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] |  |  | 0 |  |  |
Loans acquired with deteriorated credit quality |  |  |  | 6,685 |  |  |
Construction and land development |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  | 12,629 |  |  |
Individually evaluated for impairment |  |  |  | 33 |  |  |
Total allowance for loan losses |  | 41,222 | 41,897 | 12,662 | 11,874 | 11,206 | 11,128
Collectively evaluated for impairment |  |  |  | 2,426,901 |  |  |
Individually evaluated for impairment |  | 4,362 |  | 561 |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | 2,728,439 |  | 2,430,483 |  |  |
Construction and land development | Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 4,362 |  |  |  |  |
Construction and land development | Business Assets |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 0 |  |  |  |  |
Construction and land development | Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 0 |  |  |  |  |
Construction and land development | Loans acquired with deteriorated credit quality |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] |  |  | 0 |  |  |
Loans acquired with deteriorated credit quality |  |  |  | 3,021 |  |  |
Commercial and industrial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  | 35,401 |  |  |
Individually evaluated for impairment |  |  |  | 711 |  |  |
Total allowance for loan losses |  | 102,208 | 100,610 | 36,112 | 34,575 | 37,436 | 31,731
Collectively evaluated for impairment |  |  |  | 6,274,280 |  |  |
Individually evaluated for impairment |  | 30,789 |  | 14,295 |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | 8,395,963 |  | 6,290,296 |  |  |
Commercial and industrial | Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 2,052 |  |  |  |  |
Commercial and industrial | Business Assets |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 28,692 |  |  |  |  |
Commercial and industrial | Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 45 |  |  |  |  |
Commercial and industrial | Loans acquired with deteriorated credit quality |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] |  |  | 0 |  |  |
Loans acquired with deteriorated credit quality |  |  |  | 1,721 |  |  |
Consumer and other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  | 3,586 |  |  |
Individually evaluated for impairment |  |  |  | 9 |  |  |
Total allowance for loan losses |  | 6,981 | 6,278 | 3,595 | 4,304 | 2,114 | 5,423
Collectively evaluated for impairment |  |  |  | 289,106 |  |  |
Individually evaluated for impairment |  | 21 |  | 148 |  |  |
Loans and Leases Receivable, Net of Deferred Income |  | 343,461 |  | 289,254 |  |  |
Consumer and other | Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 0 |  |  |  |  |
Consumer and other | Business Assets |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 0 |  |  |  |  |
Consumer and other | Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  | 21 |  |  |  |  |
Consumer and other | Loans acquired with deteriorated credit quality |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] |  |  | 0 |  |  |
Loans acquired with deteriorated credit quality |  |  |  | 0 |  |  |
Unallocated |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |
Total allowance for loan losses |  | $ 0 | $ 0 | 985 | $ 2,507 | $ 182 | $ 677
Unallocated | Loans acquired with deteriorated credit quality |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses |  |  |  |  |  |  |
[1] | Prior to the adoption of ASC 326 on January 1, 2020, an allowance for loan losses was recorded on loans acquired with deteriorated credit quality only in the event of additional credit deterioration subsequent to acquisition.

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