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Loans and Allowance for Loan Losses - Loans Outstanding by Impairment Methodology (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | $ 137,457 | $ 118,356
Collectively evaluated for impairment | 4,954,693 | 4,850,240
Loans Acquired with Deteriorated Credit Quality [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans acquired with deteriorated credit quality | 2,253 | 7,380
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 26,741 | 17,846
Collectively evaluated for impairment | 628,450 | 608,775
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 28,050 | 25,333
Collectively evaluated for impairment | 1,152,455 | 1,120,795
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 9,303 | 9,026
Collectively evaluated for impairment | 325,072 | 319,676
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 20,127 | 21,285
Collectively evaluated for impairment | 836,787 | 806,219
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 35,523 | 19,432
Collectively evaluated for impairment | 1,329,604 | 1,264,222
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 3,304 | 3,093
Collectively evaluated for impairment | 342,236 | 323,769
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 10 | 209
Collectively evaluated for impairment | 143,863 | 141,700
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 14,399 | 22,132
Collectively evaluated for impairment | 196,226 | 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 | $ 2,253 | $ 7,380

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