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Loans Held for Investment and Allowance for Credit Losses on Loans - Loans Outstanding by Impairment Methodology (Detail) $ in Thousands | Dec. 31, 2019 USD ($)
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Accounts, Notes, Loans and Financing Receivable [Line Items] |
Individually evaluated for impairment | $ 113,796
Collectively evaluated for impairment | 5,545,349
Loans Acquired with Deteriorated Credit Quality [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans acquired with deteriorated credit quality | 2,998
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Individually evaluated for impairment | 21,690
Collectively evaluated for impairment | 685,726
Real Estate [Member] | Non-residential Real Estate Other [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Individually evaluated for impairment | 23,933
Collectively evaluated for impairment | 1,113,242
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Individually evaluated for impairment | 9,468
Collectively evaluated for impairment | 331,104
Real Estate [Member] | Residential Real Estate Other [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Individually evaluated for impairment | 17,898
Collectively evaluated for impairment | 902,934
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Individually evaluated for impairment | 27,016
Collectively evaluated for impairment | 1,427,377
Consumer Other [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Individually evaluated for impairment | 3,090
Collectively evaluated for impairment | 359,264
Other Loans [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Individually evaluated for impairment | 231
Collectively evaluated for impairment | 153,784
Acquired Loans [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Individually evaluated for impairment | 10,470
Collectively evaluated for impairment | 143,351
Acquired Loans [Member] | Loans Acquired with Deteriorated Credit Quality [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans acquired with deteriorated credit quality | 860
Pegasus Bank [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Collectively evaluated for impairment | 428,567
Pegasus Bank [Member] | Loans Acquired with Deteriorated Credit Quality [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans acquired with deteriorated credit quality | $ 2,138

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