Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Goodwill and other intangibles	$ 45,718		$ 45,718		$ 42,911
Total assets	1,925,119		1,925,119		1,869,902
Net interest income	16,889	$ 9,749	33,636	$ 18,741
Provision for loan losses	990	850	1,770	1,300
Service fees, security gains and other noninterest income	5,737	4,409	10,683	8,446
Noninterest expense	14,176	11,507	27,716	20,791
Amortization and depreciation expense	607	580	1,511	1,047
INCOME BEFORE INCOME TAXES	6,853	1,221	13,322	4,049
Income taxes	1,833	409	3,504	1,026
NET INCOME	5,020	812	9,818	3,023
Eliminations And Others
Segment Reporting Information [Line Items]
Goodwill and other intangibles	(646)		(646)		(646)
Total assets	214		214		391
Net interest income	(28)	(4)	(48)	(7)
Provision for loan losses	0	0	0	0
Service fees, security gains and other noninterest income	(134)	(67)	(159)	(132)
Noninterest expense	599	2,182	989	2,577
Amortization and depreciation expense	(24)	0	1	0
INCOME BEFORE INCOME TAXES	(737)	(2,253)	(1,197)	(2,716)
Income taxes	(218)	(367)	(360)	(524)
NET INCOME	(519)	(1,886)	(837)	(2,192)
Trust Segment | Operating Segments
Segment Reporting Information [Line Items]
Goodwill and other intangibles	4,824		4,824		4,967
Total assets	11,572		11,572		11,078
Net interest income	22	15	42	30
Provision for loan losses	0	0	0	0
Service fees, security gains and other noninterest income	1,592	1,531	3,113	3,203
Noninterest expense	1,161	1,241	2,313	2,437
Amortization and depreciation expense	76	86	152	171
INCOME BEFORE INCOME TAXES	377	219	690	625
Income taxes	128	74	235	212
NET INCOME	249	145	455	413
Bank Segment | Operating Segments
Segment Reporting Information [Line Items]
Goodwill and other intangibles	38,534		38,534		35,412
Total assets	1,909,553		1,909,553		1,854,306
Net interest income	16,895	9,738	33,642	18,718
Provision for loan losses	990	850	1,770	1,300
Service fees, security gains and other noninterest income	3,783	2,166	6,744	4,093
Noninterest expense	12,063	7,657	23,690	15,015
Amortization and depreciation expense	465	404	1,179	696
INCOME BEFORE INCOME TAXES	7,160	2,993	13,747	5,800
Income taxes	1,905	613	3,601	1,222
NET INCOME	5,255	2,380	10,146	4,578
Retirement Consulting Segment | Operating Segments
Segment Reporting Information [Line Items]
Goodwill and other intangibles	3,006		3,006		3,178
Total assets	3,780		3,780		$ 4,127
Net interest income	0	0	0	0
Provision for loan losses	0	0	0	0
Service fees, security gains and other noninterest income	496	779	985	1,282
Noninterest expense	353	427	724	762
Amortization and depreciation expense	90	90	179	180
INCOME BEFORE INCOME TAXES	53	262	82	340
Income taxes	18	89	28	116
NET INCOME	$ 35	$ 173	$ 54	$ 224