Business Segments (Statement of Operations and Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net interest income (expense)	$ 32,602	$ 34,584
Provision for credit losses	7,036	650
Net interest income after provision for loan losses	25,566	33,934
Noninterest income	19,927	15,367
Depreciation and amortization expense	1,013	1,077
Other noninterest expenses related to segments	29,440	25,887
Total noninterest expense	30,453	26,964
Income before income taxes	15,040	22,337
Income tax expense	3,139	4,842
Net income	11,901	17,495
Total assets	5,620,979	5,154,729	$ 5,292,659
Expenditures for long-lived assets	628	1,655
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	29,009	27,302
Provision for credit losses	7,036	650
Net interest income after provision for loan losses	21,973	26,652
Noninterest income	10,665	5,455
Depreciation and amortization expense	619	672
Other noninterest expenses related to segments	18,842	15,758
Total noninterest expense	19,461	16,430
Income before income taxes	13,177	15,677
Income tax expense	2,764	3,421
Net income	10,413	12,256
Total assets	4,367,469	3,884,052
Expenditures for long-lived assets	526	1,300
Wealth Management Services [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	(67)	(127)
Provision for credit losses	0	0
Net interest income after provision for loan losses	(67)	(127)
Noninterest income	8,689	9,252
Depreciation and amortization expense	354	365
Other noninterest expenses related to segments	6,846	6,478
Total noninterest expense	7,200	6,843
Income before income taxes	1,422	2,282
Income tax expense	356	617
Net income	1,066	1,665
Total assets	74,283	76,657
Expenditures for long-lived assets	53	292
Corporate [Member]
Segment Reporting Information [Line Items]
Net interest income (expense)	3,660	7,409
Provision for credit losses	0	0
Net interest income after provision for loan losses	3,660	7,409
Noninterest income	573	660
Depreciation and amortization expense	40	40
Other noninterest expenses related to segments	3,752	3,651
Total noninterest expense	3,792	3,691
Income before income taxes	441	4,378
Income tax expense	19	804
Net income	422	3,574
Total assets	1,179,227	1,194,020
Expenditures for long-lived assets	$ 49	$ 63