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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, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  | $ 81,435,000 | $ 78,934,000 |  |
Individually evaluated for impairment |  | 5,518,000 | 3,964,000 |  |
Total allowance for loan losses |  | 87,194,000 | 83,575,000 | $ 70,204,000 | $ 67,240,000
Collectively evaluated for impairment |  | 18,055,200,000 | 17,599,074,000 |  |
Individually evaluated for impairment |  | 96,004,000 | 83,146,000 |  |
Loans |  | 18,174,906,000 | 17,707,549,000 |  |
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 |  | 23,702,000 | 25,329,000 |  |
Commercial real estate - mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  | 28,646,000 | 26,222,000 |  |
Individually evaluated for impairment |  | 1,521,000 | 724,000 |  |
Total allowance for loan losses |  | 30,167,000 | 26,946,000 | 22,688,000 | 21,188,000
Collectively evaluated for impairment |  | 7,372,359,000 | 7,124,117,000 |  |
Individually evaluated for impairment |  | 35,213,000 | 28,838,000 |  |
Loans |  | 7,419,146,000 | 7,164,954,000 |  |
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] | 0 | 0 |  |
Loans acquired with deteriorated credit quality |  | 11,574,000 | 11,999,000 |  |
Consumer real estate - mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  | 5,988,000 | 6,227,000 |  |
Individually evaluated for impairment |  | 2,381,000 | 1,443,000 |  |
Total allowance for loan losses |  | 8,369,000 | 7,670,000 | 5,100,000 | 5,031,000
Collectively evaluated for impairment |  | 2,844,051,000 | 2,808,142,000 |  |
Individually evaluated for impairment |  | 35,099,000 | 27,111,000 |  |
Loans |  | 2,887,628,000 | 2,844,447,000 |  |
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] | 0 | 0 |  |
Loans acquired with deteriorated credit quality |  | 8,478,000 | 9,194,000 |  |
Construction and land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  | 10,860,000 | 11,100,000 |  |
Individually evaluated for impairment |  | 55,000 | 28,000 |  |
Total allowance for loan losses |  | 10,915,000 | 11,128,000 | 10,116,000 | 8,962,000
Collectively evaluated for impairment |  | 2,093,358,000 | 2,066,613,000 |  |
Individually evaluated for impairment |  | 868,000 | 2,367,000 |  |
Loans |  | 2,097,570,000 | 2,072,455,000 |  |
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 | 0 |  |
Loans acquired with deteriorated credit quality |  | 3,344,000 | 3,475,000 |  |
Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  | 31,238,000 | 30,290,000 |  |
Individually evaluated for impairment |  | 1,461,000 | 1,441,000 |  |
Total allowance for loan losses |  | 32,699,000 | 31,731,000 | 26,648,000 | 24,863,000
Collectively evaluated for impairment |  | 5,394,721,000 | 5,246,913,000 |  |
Individually evaluated for impairment |  | 24,493,000 | 23,847,000 |  |
Loans |  | 5,419,520,000 | 5,271,421,000 |  |
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 | 0 |  |
Loans acquired with deteriorated credit quality |  | 306,000 | 661,000 |  |
Consumer and other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Collectively evaluated for impairment |  | 4,703,000 | 5,095,000 |  |
Individually evaluated for impairment |  | 100,000 | 328,000 |  |
Total allowance for loan losses |  | 4,803,000 | 5,423,000 | 5,476,000 | 5,874,000
Collectively evaluated for impairment |  | 350,711,000 | 353,289,000 |  |
Individually evaluated for impairment |  | 331,000 | 983,000 |  |
Loans |  | 351,042,000 | 354,272,000 |  |
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 |  | 241,000 | 677,000 | $ 176,000 | $ 1,322,000
Unallocated | Loans acquired with deteriorated credit quality(1) |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total allowance for loan losses | [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 only in the event of subsequent credit deterioration.

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