Other Noninterest Income and Other Noninterest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Operating Cost and Expense [Line Items]
Other Noninterest Income	$ 36,359	$ 29,277	$ 49,749
Other Noninterest Expense	269,858	210,629	193,014
PCI Loans
Other Operating Cost and Expense [Line Items]
Proceeds from Recoveries of Loans Previously Charged off	21,200	16,200	29,700
Telecommunication
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	14,406	10,834	10,033
Cardholder Reward Programs
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	11,069	8,252	6,266
Processing Fees Paid To Third Parties
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	18,779	17,089	15,095
Cardholder Processing
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	21,735	15,133	13,780
Merchant Processing
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	58,231	42,661	35,279
Collection
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	9,649	11,595	21,209
Consultant
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	8,925	10,168	9,740
Core Deposit Intangible Amortization [Member]
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	18,892	6,955	2,308
Advertising
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	12,431	11,461	8,286
Other Expense
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	$ 95,741	$ 76,481	$ 71,018