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Loans and Allowance for Loan Losses - Details on Allowance for Loan Losses and Recorded Investment by Loan Classification and Impairment Evaluation Method (Details) - USD ($) | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  | $ 76,774,000 |  | $ 63,147,000 |  |  |
Individually evaluated for impairment |  | 2,378,000 |  | 2,198,000 |  |  |
Total allowance for loan losses |  | 79,985,000 | $ 75,670,000 | 67,240,000 | $ 65,159,000 | $ 61,944,000 | $ 58,980,000
Collectively evaluated for impairment |  | 17,346,542,000 |  | 15,531,482,000 |  |  |
Individually evaluated for impairment |  | 83,861,000 |  | 58,979,000 |  |  |
Loans |  | 17,464,009,000 |  | 15,633,116,000 |  |  |
Loans acquired with deteriorated credit quality (1) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] | 11,000 |  | 573,000 |  |  |
Loans acquired with deteriorated credit quality |  | 33,606,000 |  | 42,655,000 |  |  |
Commercial real estate - mortgage |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  | 26,047,000 |  | 20,753,000 |  |  |
Individually evaluated for impairment |  | 461,000 |  | 95,000 |  |  |
Total allowance for loan losses |  | 26,517,000 | 24,848,000 | 21,188,000 | 20,790,000 | 16,002,000 | 13,655,000
Collectively evaluated for impairment |  | 7,164,591,000 |  | 6,630,593,000 |  |  |
Individually evaluated for impairment |  | 31,739,000 |  | 18,214,000 |  |  |
Loans |  | 7,215,119,000 |  | 6,669,610,000 |  |  |
Commercial real estate - mortgage | Loans acquired with deteriorated credit quality (1) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] | 9,000 |  | 340,000 |  |  |
Loans acquired with deteriorated credit quality |  | 18,789,000 |  | 20,803,000 |  |  |
Consumer real estate - mortgage |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  | 6,235,000 |  | 4,460,000 |  |  |
Individually evaluated for impairment |  | 490,000 |  | 410,000 |  |  |
Total allowance for loan losses |  | 6,727,000 | 5,853,000 | 5,031,000 | 5,303,000 | 7,835,000 | 6,564,000
Collectively evaluated for impairment |  | 2,783,196,000 |  | 2,534,996,000 |  |  |
Individually evaluated for impairment |  | 22,128,000 |  | 12,172,000 |  |  |
Loans |  | 2,815,160,000 |  | 2,561,214,000 |  |  |
Consumer real estate - mortgage | Loans acquired with deteriorated credit quality (1) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] | 2,000 |  | 161,000 |  |  |
Loans acquired with deteriorated credit quality |  | 9,836,000 |  | 14,046,000 |  |  |
Construction and land development |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  | 10,967,000 |  | 8,879,000 |  |  |
Individually evaluated for impairment |  | 15,000 |  | 66,000 |  |  |
Total allowance for loan losses |  | 10,982,000 | 10,984,000 | 8,962,000 | 7,523,000 | 5,126,000 | 3,624,000
Collectively evaluated for impairment |  | 2,051,413,000 |  | 1,896,553,000 |  |  |
Individually evaluated for impairment |  | 3,447,000 |  | 5,167,000 |  |  |
Loans |  | 2,059,009,000 |  | 1,908,288,000 |  |  |
Construction and land development | Loans acquired with deteriorated credit quality (1) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] | 0 |  | 17,000 |  |  |
Loans acquired with deteriorated credit quality |  | 4,149,000 |  | 6,568,000 |  |  |
Commercial and industrial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  | 28,859,000 |  | 23,181,000 |  |  |
Individually evaluated for impairment |  | 1,265,000 |  | 1,627,000 |  |  |
Total allowance for loan losses |  | 30,124,000 | 28,338,000 | 24,863,000 | 23,407,000 | 24,235,000 | 24,743,000
Collectively evaluated for impairment |  | 4,979,829,000 |  | 4,116,677,000 |  |  |
Individually evaluated for impairment |  | 25,586,000 |  | 23,426,000 |  |  |
Loans |  | 5,006,247,000 |  | 4,141,341,000 |  |  |
Commercial and industrial | Loans acquired with deteriorated credit quality (1) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] | 0 |  | 55,000 |  |  |
Loans acquired with deteriorated credit quality |  | 832,000 |  | 1,238,000 |  |  |
Consumer and other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  | 4,666,000 |  | 5,874,000 |  |  |
Individually evaluated for impairment |  | 147,000 |  | 0 |  |  |
Total allowance for loan losses |  | 4,813,000 | 5,172,000 | 5,874,000 | 6,919,000 | 7,549,000 | 9,520,000
Collectively evaluated for impairment |  | 367,513,000 |  | 352,663,000 |  |  |
Individually evaluated for impairment |  | 961,000 |  | 0 |  |  |
Loans |  | 368,474,000 |  | 352,663,000 |  |  |
Consumer and other | Loans acquired with deteriorated credit quality (1) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality |  | 0 |  | 0 |  |  |
Unallocated |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |
Total allowance for loan losses |  | 822,000 | $ 475,000 | 1,322,000 | $ 1,217,000 | $ 1,197,000 | $ 874,000
Unallocated | Loans acquired with deteriorated credit quality (1) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | [1] |  |  |  |  |  |
[1] | (1) Loans acquired with deteriorated credit quality are recorded at fair value at the time of acquisition. An allowance for loan losses is recorded resulting from subsequent credit deterioration.

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