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Loans and Allowance for Loan Losses Loan Classification by Risk Rating Category (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Receivables [Abstract] |  |  |  |
Percentage of loan portfolio as commercial loan |  | 80.80% |  |
Risk rated loans |  | $ 1,000,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 17,707,549,000 | $ 15,633,116,000 | $ 8,449,925,000
Nonaccrual loans | [1] | 77,248,000 | 41,519,000 |
Average balance of impaired loans |  | 75,257,000 | 40,830,000 | 32,474,000
Interest Lost on impaired loans |  | $ 4,200,000 | 2,700,000 | 2,100,000
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 |  | $ 37,900,000 | 26,400,000 |
Amount drawn from loans and other extensions of credit granted |  | 18,300,000 | 16,100,000 |
Commercial loans held-for-sale |  | 15,954,000 | 25,456,000 |
Mortgage loans held-for-sale |  | 31,800,000 | 102,700,000 |
Gains on mortgage loans sold, net |  | 14,564,000 | 18,625,000 | 15,754,000
Mortgage loans held for sale sold |  | 1,234,551,000 | 1,090,489,000 | 803,498,000
Troubled Debt Restructurings |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 5,900,000 | 6,600,000 |
Impaired loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 83,146,000 | 58,979,000 |
Pass | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 17,346,673,000 | 15,237,775,000 |
Special Mention | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 93,163,000 | 168,713,000 |
Substandard | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 179,879,000 | 169,173,000 |
Substandard | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 87,834,000 | 57,455,000 |
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 |  | 7,164,954,000 | 6,669,610,000 | 3,193,496,000
Commercial Real Estate | Pass | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 6,998,485,000 | 6,487,368,000 |
Commercial Real Estate | Special Mention | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 55,932,000 | 94,134,000 |
Commercial Real Estate | Substandard | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 78,202,000 | 72,044,000 |
Commercial Real Estate | Substandard | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 32,335,000 | 16,064,000 |
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 |  | 2,844,447,000 | 2,561,214,000 | 1,185,917,000
Nonaccrual loans | [1] | 22,564,000 | 9,320,000 |
Consumer Real Estate | Pass | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 2,787,570,000 | 2,503,688,000 |
Consumer Real Estate | Special Mention | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 7,902,000 | 18,356,000 |
Consumer Real Estate | Substandard | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 20,906,000 | 21,053,000 |
Consumer Real Estate | Substandard | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 28,069,000 | 18,117,000 |
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 |  | 2,072,455,000 | 1,908,288,000 |
Construction and Land Development | Pass | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 2,059,376,000 | 1,880,704,000 |
Construction and Land Development | Special Mention | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 4,334,000 | 8,148,000 |
Construction and Land Development | Substandard | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 5,358,000 | 13,468,000 |
Construction and Land Development | Substandard | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 3,387,000 | 5,968,000 |
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 |  | 5,271,421,000 | 4,141,341,000 |
Commercial and Industrial | Pass | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 5,148,726,000 | 4,014,656,000 |
Commercial and Industrial | Special Mention | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 24,284,000 | 46,898,000 |
Commercial and Industrial | Substandard | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 75,351,000 | 62,529,000 |
Commercial and Industrial | Substandard | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 23,060,000 | 17,258,000 |
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 |  | 354,272,000 | 352,663,000 | 266,129,000
Nonaccrual loans | [1] | 983,000 | 0 |
Consumer and Other | Pass | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 352,516,000 | 351,359,000 |
Consumer and Other | Special Mention | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 711,000 | 1,177,000 |
Consumer and Other | Substandard | Accruing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 62,000 | 79,000 |
Consumer and Other | Substandard | Nonaccrual Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 983,000 | 48,000 |
Consumer and Other | 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 |  | 5,271,421,000 | 4,141,341,000 | 2,891,710,000
Nonaccrual loans | [1] | 23,022,000 | 17,222,000 |
Construction and Land Development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 2,072,455,000 | 1,908,288,000 | $ 912,673,000
Nonaccrual loans | [1] | 2,020,000 | 2,878,000 |
Current and accruing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 17,545,113,000 | 15,488,784,000 |
Current and accruing | Consumer Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 2,794,630,000 | 2,521,748,000 |
Current and accruing | Consumer and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 349,537,000 | 345,076,000 |
Current and accruing | Commercial and Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 5,225,205,000 | 4,114,127,000 |
Current and accruing | Construction and Land Development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 2,063,201,000 | 1,894,560,000 |
Financing Receivables 30 To 89 Days Past Due and Still Accruing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 58,301,000 | 56,019,000 |
Financing Receivables 30 To 89 Days Past Due and Still Accruing | Consumer Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 18,059,000 | 14,835,000 |
Financing Receivables 30 To 89 Days Past Due and Still Accruing | Consumer and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 3,276,000 | 6,311,000 |
Financing Receivables 30 To 89 Days Past Due and Still Accruing | Commercial and Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 21,451,000 | 7,406,000 |
Financing Receivables 30 To 89 Days Past Due and Still Accruing | Construction and Land Development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 3,759,000 | 4,136,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 1,558,000 | 4,139,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing | Consumer Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 0 | 1,265,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing | Consumer and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 476,000 | 1,276,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing | Commercial and Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 1,082,000 | 1,348,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing | Construction and Land Development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 0 | 146,000 |
Past Due and Accruing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 59,859,000 | 60,158,000 |
Past Due and Accruing | Consumer Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 18,059,000 | 16,100,000 |
Past Due and Accruing | Consumer and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 3,752,000 | 7,587,000 |
Past Due and Accruing | Commercial and Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 22,533,000 | 8,754,000 |
Past Due and Accruing | Construction and Land Development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 3,759,000 | 4,282,000 |
Commercial Real Estate Owner Occupied | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans | [1] | 16,025,000 | 11,395,000 |
Commercial Real Estate Owner Occupied | Current and accruing | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 2,623,700,000 | 2,435,819,000 |
Commercial Real Estate Owner Occupied | Financing Receivables 30 To 89 Days Past Due and Still Accruing | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 10,170,000 | 6,772,000 |
Commercial Real Estate Owner Occupied | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 0 | 104,000 |
Commercial Real Estate Owner Occupied | Past Due and Accruing | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 10,170,000 | 6,876,000 |
Commercial Real Estate All Other | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans | [1] | 12,634,000 | 704,000 |
Commercial Real Estate All Other | Current and accruing | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 4,488,840,000 | 4,177,454,000 |
Commercial Real Estate All Other | Financing Receivables 30 To 89 Days Past Due and Still Accruing | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 1,586,000 | 16,559,000 |
Commercial Real Estate All Other | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 0 | 0 |
Commercial Real Estate All Other | Past Due and Accruing | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 1,586,000 | 16,559,000 |
Purchase credit impaired, nonaccruing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans |  | 10,586,000 | 15,936,000 |
Purchase credit impaired, nonaccruing | Consumer Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans |  | 5,505,000 | 8,797,000 |
Purchase credit impaired, nonaccruing | Consumer and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans |  | 0 | 0 |
Purchase credit impaired, nonaccruing | Commercial and Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans |  | 38,000 | 84,000 |
Purchase credit impaired, nonaccruing | Construction and Land Development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans |  | 1,367,000 | 3,090,000 |
Purchase credit impaired, nonaccruing | Commercial Real Estate Owner Occupied | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans |  | 874,000 | 1,105,000 |
Purchase credit impaired, nonaccruing | Commercial Real Estate All Other | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual loans |  | 2,802,000 | 2,860,000 |
Purchase credit impaired, accruing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 14,743,000 | 26,719,000 |
Purchase credit impaired, accruing | Consumer Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 3,689,000 | 5,249,000 |
Purchase credit impaired, accruing | Consumer and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 0 | 0 |
Purchase credit impaired, accruing | Commercial and Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 623,000 | 1,154,000 |
Purchase credit impaired, accruing | Construction and Land Development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 2,108,000 | 3,478,000 |
Purchase credit impaired, accruing | Commercial Real Estate Owner Occupied | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 2,664,000 | 4,820,000 |
Purchase credit impaired, accruing | Commercial Real Estate All Other | Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | $ 5,659,000 | $ 12,018,000 |
Construction and Land Development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of credit exposure to risk based capital |  | 85.20% | 89.40% |
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 |  | 277.70% | 297.10% |
[1] | (1)Approximately $52.5 million and $45.8 million of nonaccrual loans as of December 31, 2018 and December 31, 2017, respectively, were performing pursuant to their contractual terms at those dates.

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- Definition Refers to percentage of credit exposure (loans outstanding plus unfunded lines of credit) to total risk based capital to borrowers in certain industries. + References No definition available. + Details
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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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