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Noninterest Income (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
Noninterest income
Mortgage banking									$ 61,641	$ 25,805	$ 17,630
Net gains (losses) on investment securities									2,737	357	85
Bank-owned life insurance income									797	803	804
Total noninterest income	$ 38,696	$ 45,256	$ 38,230	$ 27,189	$ 29,556	$ 29,580	$ 29,984	$ 25,074	149,371	114,194	102,749
Retirement and Benefit Services
Noninterest income
Revenue									60,956	63,811	63,316
Wealth Management
Noninterest income
Revenue									17,451	15,502	14,900
Deposit Account
Noninterest income
Revenue									1,409	1,772	1,808
Interchange Fees
Noninterest income
Revenue									2,140	1,972	2,005
Transactional Fees
Noninterest income
Revenue									1,246	1,236	1,106
Other Noninterest
Noninterest income
Revenue									$ 994	$ 2,936	$ 1,096

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The amount of non interest income on mortgage banking.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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