Other Noninterest Income and Other Noninterest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Operating Cost and Expense [Line Items]
Other Noninterest Income	$ 34,170	$ 36,359	$ 29,277
Other Noninterest Expense	200,047	189,892	152,835
PCI Loans
Other Operating Cost and Expense [Line Items]
Proceeds from Recoveries of Loans Previously Charged off	20,100	21,200	16,200
Telecommunication
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	14,496	14,406	10,834
Cardholder Reward Programs
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	10,615	11,069	8,252
Processing Fees Paid To Third Parties
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	18,976	18,779	17,089
Collection
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	8,889	9,649	11,595
Consultant
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	10,931	8,925	10,168
Core Deposit Intangible Amortization [Member]
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	16,851	18,892	6,955
Advertising
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	10,239	12,431	11,461
Other Expense
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	$ 109,050	$ 95,741	$ 76,481