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Borrowings - Summary of Bancorps Short Term Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
FHLB Advances      
Short-term Debt [Line Items]      
Maximum outstanding at any month end $ 1,383,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
$ 769,750us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
$ 411,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Average balance during the year 898,396us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
120,309us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
74,336us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Weighted-average interest rate during the year 0.46%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
0.55%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
0.38%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Federal Funds Purchased      
Short-term Debt [Line Items]      
Maximum outstanding at any month end 35,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
125,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
55,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
Average balance during the year $ 13,312us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
$ 32,351us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
$ 4,336us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
Weighted-average interest rate during the year 0.31%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
0.31%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
0.24%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember