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Loans and Allowance for Loan Losses Loan Classification by Risk Rating Category (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Receivables [Abstract] |  |  |  |
Percentage of loan portfolio as commercial loan |  | 80.30% |  |
Risk rated loans |  | $ 1,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 19,787,876 | $ 17,707,549 | $ 15,633,116
Nonaccrual loans | [1] | 53,939 | 77,248 |
Average balance of impaired loans |  | 76,919 | 75,257 | 40,830
Interest Lost on impaired loans |  | $ 3,000 | 4,200 | 2,700
Percentage of credit exposure to risk based capital |  | 25.00% |  |
Loans and other extensions of credit granted to directors, executive officers, and their related entities |  | $ 10,600 | 37,900 |
Amount drawn from loans and other extensions of credit granted |  | 6,800 | 18,300 |
Commercial loans held-for-sale |  | 17,585 | 15,954 |
Mortgage loans held-for-sale |  | 61,600 | 31,800 |
Gains on mortgage loans sold, net |  | 24,335 | 14,564 | 18,625
Mortgage Loan Volumes Sold |  | 1,100,000 | 1,000,000 |
Troubled Debt Restructurings |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 4,900 | 5,900 |
Impaired loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 58,100 | 83,100 |
Pass | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 19,299,393 | 17,346,673 |
Special Mention | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 148,267 | 93,163 |
Substandard | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 278,611 | 179,879 |
Substandard | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 61,605 | 87,834 |
Doubtful | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 0 | 0 |
Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 7,709,218 | 7,164,954 | 6,669,610
Commercial Real Estate | Pass | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 7,499,725 | 6,998,485 |
Commercial Real Estate | Special Mention | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 51,147 | 55,932 |
Commercial Real Estate | Substandard | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 139,518 | 78,202 |
Commercial Real Estate | Substandard | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 18,828 | 32,335 |
Commercial Real Estate | Doubtful | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 0 | 0 |
Consumer Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 3,068,625 | 2,844,447 | 2,561,214
Nonaccrual loans | [1] | 20,995 | 22,564 |
Consumer Real Estate | Pass | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 3,019,203 | 2,787,570 |
Consumer Real Estate | Special Mention | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 13,787 | 7,902 |
Consumer Real Estate | Substandard | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 10,969 | 20,906 |
Consumer Real Estate | Substandard | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 24,666 | 28,069 |
Consumer Real Estate | Doubtful | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 0 | 0 |
Construction and Land Development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 2,430,483 | 2,072,455 |
Construction and Land Development | Pass | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 2,422,347 | 2,059,376 |
Construction and Land Development | Special Mention | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 2,816 | 4,334 |
Construction and Land Development | Substandard | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 3,042 | 5,358 |
Construction and Land Development | Substandard | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 2,278 | 3,387 |
Construction and Land Development | Doubtful | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 0 | 0 |
Commercial and Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 6,290,296 | 5,271,421 |
Commercial and Industrial | Pass | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 6,069,757 | 5,148,726 |
Commercial and Industrial | Special Mention | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 79,819 | 24,284 |
Commercial and Industrial | Substandard | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 125,035 | 75,351 |
Commercial and Industrial | Substandard | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 15,685 | 23,060 |
Commercial and Industrial | Doubtful | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 0 | 0 |
Consumer and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 289,254 | 354,272 | $ 352,663
Nonaccrual loans | [1] | 148 | 983 |
Consumer and Other | Pass | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 288,361 | 352,516 |
Consumer and Other | Special Mention | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 698 | 711 |
Consumer and Other | Substandard | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 47 | 62 |
Consumer and Other | Substandard | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 148 | 983 |
Consumer and Other | Doubtful | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 0 | 0 |
Commercial Real Estate Owner Occupied | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans | [1] | 10,791 | 16,025 |
Commercial Real Estate All Other | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans | [1] | 7,169 | 12,634 |
Purchase credit impaired, nonaccruing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans |  | 7,666 | 10,586 |
Purchase credit impaired, nonaccruing | Consumer Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans |  | 3,671 | 5,505 |
Purchase credit impaired, nonaccruing | Consumer and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans |  | 0 | 0 |
Purchase credit impaired, nonaccruing | Commercial Real Estate Owner Occupied | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans |  | 863 | 874 |
Purchase credit impaired, nonaccruing | Commercial Real Estate All Other | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans |  | 5 | 2,802 |
Purchase credit impaired, accruing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 13,249 | 14,743 |
Purchase credit impaired, accruing | Consumer Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 3,014 | 3,689 |
Purchase credit impaired, accruing | Consumer and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 0 | 0 |
Purchase credit impaired, accruing | Commercial Real Estate Owner Occupied | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 3,366 | 2,664 |
Purchase credit impaired, accruing | Commercial Real Estate All Other | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | $ 5,254 | $ 5,659 |
Construction and Land Development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of credit exposure to risk based capital |  | 83.60% | 85.20% |
Non-owner occupied commercial real estate and multifamily loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of credit exposure to risk based capital |  | 268.30% | 277.70% |
[1] | Approximately $35.8 million and $52.5 million of nonaccrual loans as of December 31, 2019 and December 31, 2018, respectively, were performing pursuant to their contractual terms at those dates.

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