Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Goodwill and other intangibles	$ 42,574		$ 42,911
Total assets	1,860,307		1,869,902
Net interest income	16,747	$ 8,992
Provision for loan losses	780	450
Service fees, security gains and other noninterest income	4,946	4,037
Noninterest expense	13,665	9,284
Amortization and depreciation expense	779	467
INCOME BEFORE INCOME TAXES	6,469	2,828
Income taxes	1,671	617
NET INCOME	4,798	2,211
Eliminations And Others
Segment Reporting Information [Line Items]
Goodwill and other intangibles	(646)		(646)
Total assets	447		391
Net interest income	(20)	(3)
Provision for loan losses	0	0
Service fees, security gains and other noninterest income	(25)	(65)
Noninterest expense	390	395
Amortization and depreciation expense	25	0
INCOME BEFORE INCOME TAXES	(460)	(463)
Income taxes	(142)	(157)
NET INCOME	(318)	(306)
Trust Segment | Operating Segments
Segment Reporting Information [Line Items]
Goodwill and other intangibles	4,895		4,967
Total assets	11,356		11,078
Net interest income	20	15
Provision for loan losses	0	0
Service fees, security gains and other noninterest income	1,521	1,672
Noninterest expense	1,152	1,196
Amortization and depreciation expense	76	85
INCOME BEFORE INCOME TAXES	313	406
Income taxes	107	138
NET INCOME	206	268
Bank Segment | Operating Segments
Segment Reporting Information [Line Items]
Goodwill and other intangibles	35,234		35,412
Total assets	1,844,746		1,854,306
Net interest income	16,747	8,980
Provision for loan losses	780	450
Service fees, security gains and other noninterest income	2,961	1,927
Noninterest expense	11,627	7,358
Amortization and depreciation expense	714	292
INCOME BEFORE INCOME TAXES	6,587	2,807
Income taxes	1,696	609
NET INCOME	4,891	2,198
Retirement Consulting Segment | Operating Segments
Segment Reporting Information [Line Items]
Goodwill and other intangibles	3,091		3,178
Total assets	3,758		$ 4,127
Net interest income	0	0
Provision for loan losses	0	0
Service fees, security gains and other noninterest income	489	503
Noninterest expense	371	335
Amortization and depreciation expense	89	90
INCOME BEFORE INCOME TAXES	29	78
Income taxes	10	27
NET INCOME	$ 19	$ 51