Revenue from 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
Disaggregation of Revenue [Line Items]
Capital markets revenue									$ 9,491	$ 11,276	$ 4,848
Loan servicing and other fees									1,646	2,206	2,259
Net gain on sale of loans									5,779	2,342	3,283
Net gain (loss) on sale of investment securities available for sale									0	0	7
Net gain on sale of long-lived assets									2,297	0	0
Net gain (loss) on sale of OREO									148	(84)	295
Dividends on FHLB and FRB stock									1,151	1,505	1,621
Other operating income									8,148	10,288	11,546
Total noninterest income	$ 22,006	$ 21,099	$ 20,566	$ 18,300	$ 23,255	$ 19,455	$ 20,221	$ 19,253	81,971	82,184	75,982
Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									44,532	44,400	42,326
Insurance Commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									5,911	6,877	6,808
Deposit Account
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									2,868	3,374	2,989
Merchant Interchange Fees, Safe Deposit Box Rentals, and Rent Income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									3,100	2,200	2,200
Banking
Disaggregation of Revenue [Line Items]
Capital markets revenue									9,491	11,276	4,848
Loan servicing and other fees									1,646	2,206	2,259
Net gain on sale of loans									5,779	2,342	3,283
Net gain (loss) on sale of investment securities available for sale									0	0	7
Net gain on sale of long-lived assets									2,297	0	0
Net gain (loss) on sale of OREO									148	(84)	295
Dividends on FHLB and FRB stock									1,151	1,505	1,621
Other operating income									8,020	10,182	11,360
Total noninterest income									31,400	30,801	26,662
Banking | Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									0	0	0
Banking | Insurance Commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									0	0	0
Banking | Deposit Account
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									2,868	3,374	2,989
Wealth Management
Disaggregation of Revenue [Line Items]
Capital markets revenue									0	0	0
Loan servicing and other fees									0	0	0
Net gain on sale of loans									0	0	0
Net gain (loss) on sale of investment securities available for sale									0	0	0
Net gain on sale of long-lived assets									0	0	0
Net gain (loss) on sale of OREO									0	0	0
Dividends on FHLB and FRB stock									0	0	0
Other operating income									128	106	186
Total noninterest income									50,571	51,383	49,320
Wealth Management | Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									44,532	44,400	42,326
Wealth Management | Insurance Commissions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									5,911	6,877	6,808
Wealth Management | Deposit Account
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									$ 0	$ 0	$ 0