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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 ($) | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  | $ 67,224,000 | $ 63,147,000 |  |
Individually evaluated for impairment |  | 2,666,000 | 2,198,000 |  |
Total allowance for loan losses |  | 70,204,000 | 67,240,000 | $ 58,350,000 | $ 58,980,000
Collectively evaluated for impairment |  | 16,217,680,000 | 15,531,482,000 |  |
Individually evaluated for impairment |  | 69,466,000 | 58,979,000 |  |
Loans |  | 16,326,017,000 | 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] | 138,000 | 573,000 |  |
Loans acquired with deteriorated credit quality |  | 38,871,000 | 42,655,000 |  |
Commercial real estate - mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  | 21,817,000 | 20,753,000 |  |
Individually evaluated for impairment |  | 764,000 | 95,000 |  |
Total allowance for loan losses |  | 22,688,000 | 21,188,000 | 14,168,000 | 13,655,000
Collectively evaluated for impairment |  | 6,751,222,000 | 6,630,593,000 |  |
Individually evaluated for impairment |  | 22,773,000 | 18,214,000 |  |
Loans |  | 6,794,288,000 | 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] | 107,000 | 340,000 |  |
Loans acquired with deteriorated credit quality |  | 20,293,000 | 20,803,000 |  |
Consumer real estate - mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  | 4,804,000 | 4,460,000 |  |
Individually evaluated for impairment |  | 269,000 | 410,000 |  |
Total allowance for loan losses |  | 5,100,000 | 5,031,000 | 7,219,000 | 6,564,000
Collectively evaluated for impairment |  | 2,555,400,000 | 2,534,996,000 |  |
Individually evaluated for impairment |  | 14,148,000 | 12,172,000 |  |
Loans |  | 2,580,766,000 | 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] | 27,000 | 161,000 |  |
Loans acquired with deteriorated credit quality |  | 11,218,000 | 14,046,000 |  |
Construction and land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  | 10,103,000 | 8,879,000 |  |
Individually evaluated for impairment |  | 11,000 | 66,000 |  |
Total allowance for loan losses |  | 10,116,000 | 8,962,000 | 4,441,000 | 3,624,000
Collectively evaluated for impairment |  | 2,088,919,000 | 1,896,553,000 |  |
Individually evaluated for impairment |  | 381,000 | 5,167,000 |  |
Loans |  | 2,095,875,000 | 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] | 2,000 | 17,000 |  |
Loans acquired with deteriorated credit quality |  | 6,575,000 | 6,568,000 |  |
Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  | 25,234,000 | 23,181,000 |  |
Individually evaluated for impairment |  | 1,412,000 | 1,627,000 |  |
Total allowance for loan losses |  | 26,648,000 | 24,863,000 | 22,912,000 | 24,743,000
Collectively evaluated for impairment |  | 4,458,719,000 | 4,116,677,000 |  |
Individually evaluated for impairment |  | 31,383,000 | 23,426,000 |  |
Loans |  | 4,490,886,000 | 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] | 2,000 | 55,000 |  |
Loans acquired with deteriorated credit quality |  | 784,000 | 1,238,000 |  |
Consumer and other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  | 5,266,000 | 5,874,000 |  |
Individually evaluated for impairment |  | 210,000 | 0 |  |
Total allowance for loan losses |  | 5,476,000 | 5,874,000 | 8,477,000 | 9,520,000
Collectively evaluated for impairment |  | 363,420,000 | 352,663,000 |  |
Individually evaluated for impairment |  | 781,000 | 0 |  |
Loans |  | 364,202,000 | 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 |  | 1,000 | 0 |  |
Unallocated |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |
Total allowance for loan losses |  | 176,000 | 1,322,000 | $ 1,133,000 | $ 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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