Other Noninterest Income and Other Noninterest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Operating Cost and Expense [Line Items]
Other Noninterest Income	$ 18,431	$ 19,700	$ 29,081
Other Noninterest Expense	139,283	147,063	142,430
PCI Loans
Other Operating Cost and Expense [Line Items]
Proceeds from Recoveries of Loans Previously Charged off	17,400	16,600	21,100
Telecommunication
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	16,346	17,165	17,194
Consultant
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	12,801	14,345	14,963
Core Deposit Intangible Amortization
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	11,437	11,650	11,227
Advertising
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	9,391	10,471	12,172
Other Expense
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	$ 89,308	$ 93,432	$ 86,874