Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net interest income	$ 37,647	$ 37,439
Provision for loan and lease losses	3,736	1,030
Net interest income after provision for loan and lease losses	33,911	36,409
Fees for wealth management services	10,392	10,308
Insurance commissions	1,672	1,693
Capital markets revenue	2,219	666
Service charges on deposit accounts	808	713
Loan servicing and other fees	609	686
Net gain on sale of loans	319	518
Net gain on sale of investment securities available for sale	0	7
Net gain on sale of OREO	(24)	176
Other operating income	3,258	4,769
Total noninterest income	19,253	19,536
Salaries and wages	20,901	15,982
Employee benefits	4,166	3,708
Occupancy and bank premises	3,252	3,050
Amortization of intangible assets	938	879
Professional fees	1,320	748
Other operating expenses	9,147	11,663
Total noninterest expenses	39,724	36,030
Segment profit	13,440	19,915
Intersegment (revenues) expenses	0	0
Pre-tax segment profit after eliminations	$ 13,440	$ 19,915
% of segment pre-tax profit after eliminations	100.00%	100.00%
Segment assets	$ 4,631,993	$ 4,300,400	$ 4,652,485
Assets under management, administration, supervision and brokerage	14,736,500		$ 13,429,500
Banking
Segment Reporting Information [Line Items]
Net interest income	37,645	37,438
Provision for loan and lease losses	3,736	1,030
Net interest income after provision for loan and lease losses	33,909	36,408
Fees for wealth management services	0	0
Insurance commissions	0	0
Capital markets revenue	2,219	666
Service charges on deposit accounts	808	713
Loan servicing and other fees	609	686
Net gain on sale of loans	319	518
Net gain on sale of investment securities available for sale	0	7
Net gain on sale of OREO	(24)	176
Other operating income	3,237	4,725
Total noninterest income	7,168	7,491
Salaries and wages	15,775	11,156
Employee benefits	3,172	2,676
Occupancy and bank premises	2,732	2,576
Amortization of intangible assets	327	398
Professional fees	1,163	729
Other operating expenses	7,269	10,431
Total noninterest expenses	30,438	27,966
Segment profit	10,639	15,933
Intersegment (revenues) expenses	(123)	(149)
Pre-tax segment profit after eliminations	$ 10,516	$ 15,784
% of segment pre-tax profit after eliminations	78.20%	79.30%
Segment assets	$ 4,577,700	$ 4,248,400
Wealth Management
Segment Reporting Information [Line Items]
Net interest income	2	1
Provision for loan and lease losses	0	0
Net interest income after provision for loan and lease losses	2	1
Fees for wealth management services	10,392	10,308
Insurance commissions	1,672	1,693
Capital markets revenue	0	0
Service charges on deposit accounts	0	0
Loan servicing and other fees	0	0
Net gain on sale of loans	0	0
Net gain on sale of investment securities available for sale	0	0
Net gain on sale of OREO	0	0
Other operating income	21	44
Total noninterest income	12,085	12,045
Salaries and wages	5,126	4,826
Employee benefits	994	1,032
Occupancy and bank premises	520	474
Amortization of intangible assets	611	481
Professional fees	157	19
Other operating expenses	1,878	1,232
Total noninterest expenses	9,286	8,064
Segment profit	2,801	3,982
Intersegment (revenues) expenses	123	149
Pre-tax segment profit after eliminations	$ 2,924	$ 4,131
% of segment pre-tax profit after eliminations	21.80%	20.70%
Segment assets	$ 54,300	$ 52,000