LOAN PORTFOLIO - Loan Portfolio Held for Investment (Detail) - USD ($) $ in Thousands |
Mar. 31, 2018 |
Dec. 31, 2017 |
Mar. 31, 2017 |
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Financial Information [Line Items] | ||||||||
Loans held for investment | $ 8,695,890 | [1] | $ 8,850,476 | $ 8,822,349 | ||||
Less: allowance for loan and lease losses | (225,856) | (231,843) | ||||||
Loans held for investment, net | 8,470,034 | 8,618,633 | ||||||
Construction Loans [Member] | ||||||||
Financial Information [Line Items] | ||||||||
Loans held for investment | 79,150 | [2] | 111,397 | |||||
Residential Mortgage [Member] | ||||||||
Financial Information [Line Items] | ||||||||
Loans held for investment | 3,267,868 | 3,290,957 | ||||||
Commercial Real Estate Portfolio Segment [Member] | ||||||||
Financial Information [Line Items] | ||||||||
Loans held for investment | 1,552,503 | [2] | 1,614,972 | |||||
Commercial Portfolio Segment [Member] | ||||||||
Financial Information [Line Items] | ||||||||
Loans held for investment | 3,693,426 | 3,809,622 | ||||||
Commercial And Industrial Sector [Member] | ||||||||
Financial Information [Line Items] | ||||||||
Loans held for investment | 2,061,773 | [1] | 2,083,253 | |||||
Other Consumer Loans [Member] | ||||||||
Financial Information [Line Items] | ||||||||
Loans held for investment | 1,471,733 | 1,492,435 | ||||||
Finance Leases [Member] | ||||||||
Financial Information [Line Items] | ||||||||
Loans held for investment | $ 262,863 | $ 257,462 | ||||||
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