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Loans and Allowance for Loan Losses - Loans Outstanding by Impairment Methodology (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | $ 133,635 | $ 118,356
Collectively evaluated for impairment | 5,470,033 | 4,850,240
Loans Acquired with Deteriorated Credit Quality [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans acquired with deteriorated credit quality | 3,140 | 7,380
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 28,622 | 17,846
Collectively evaluated for impairment | 657,349 | 608,775
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 29,435 | 25,333
Collectively evaluated for impairment | 1,161,113 | 1,120,795
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 9,380 | 9,026
Collectively evaluated for impairment | 330,046 | 319,676
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 21,685 | 21,285
Collectively evaluated for impairment | 870,078 | 806,219
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 30,626 | 19,432
Collectively evaluated for impairment | 1,393,448 | 1,264,222
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 3,208 | 3,093
Collectively evaluated for impairment | 355,116 | 323,769
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 175 | 209
Collectively evaluated for impairment | 155,167 | 141,700
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 10,504 | 22,132
Collectively evaluated for impairment | 157,761 | 265,084
Acquired Loans [Member] | Loans Acquired with Deteriorated Credit Quality [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans acquired with deteriorated credit quality | 951 | $ 7,380
Pegasus Bank [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Collectively evaluated for impairment | 389,955 |
Pegasus Bank [Member] | Loans Acquired with Deteriorated Credit Quality [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans acquired with deteriorated credit quality | $ 2,189 |

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