Contracts With Customers Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									$ 61,220	$ 63,767	$ 57,453
RevenueOutsideScopeofTopic606									21,460	4,723	3,111
Noninterest Income	$ 17,721	$ 16,985	$ 14,631	$ 33,343	$ 18,042	$ 16,698	$ 17,825	$ 15,925	82,680	68,490	60,564
Fees and Commissions, Depositor Accounts [Domain]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									25,733	31,515	29,704
Fees and Commissions, Debit Cards [Domain]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									23,059	21,093	18,369
Fees and Commissions, Fiduciary and Trust Accounts [Domain]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									7,736	7,159	6,529
Other Non-Interest Income [Domain]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									$ 4,692	$ 4,000	$ 2,851