Other Noninterest Income and Other Noninterest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Operating Cost and Expense [Line Items]
Other Noninterest Income	$ 7,446	$ 18,431	$ 19,700
Other Noninterest Expense	145,117	139,283	147,063
PCD Loans
Other Operating Cost and Expense [Line Items]
Proceeds from Recoveries of Loans Previously Charged off		17,400	16,600
Telecommunication
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	14,255	16,346	17,165
Consultant
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	12,751	12,801	14,345
Core Deposit Intangible Amortization
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	10,010	11,437	11,650
Advertising
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	12,179	9,391	10,471
Other Expense
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	$ 95,922	$ 89,308	$ 93,432