Loans - (Loan Delinquency) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loans [Line Items]
Total loans	$ 2,860,921	$ 2,587,673
Commercial Loan [Member]
Loans [Line Items]
Total loans	1,560,430	1,427,420
Commercial Real Estate [Member]
Loans [Line Items]
Total loans	526,792	442,885
Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	744,885	684,002
Consumer [Member]
Loans [Line Items]
Total loans	28,814	33,366
Non ASC 310-30 [Member]
Loans [Line Items]
Total loans	2,715,069	2,384,843
Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total loans	1,521,150	1,369,946
Non ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total loans	437,642	321,712
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	728,361	662,550
Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total loans	27,916	30,635
ASC 310-30 [Member]
Loans [Line Items]
Total loans	145,852	202,830
ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total loans	39,280	57,474
ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total loans	89,150	121,173
ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	16,524	21,452
ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total loans	898	2,731
Total Loans [Member]
Loans [Line Items]
Total loans	2,860,921	2,587,673
Total Loans [Member] | Non ASC 310-30 [Member]
Loans [Line Items]
Total past due loans	19,435	20,042
Current	2,695,634	2,364,801
Total loans	2,715,069	2,384,843
Loans 90 days past due and still accruing		166
Non- accrual	30,717	25,647
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
Total past due loans		547
Current	90,314	29,596
Total loans	90,314	30,143
Non- accrual		188
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Current	13,306	5,575
Total loans	13,306	5,575
Total Loans [Member] | Non ASC 310-30 [Member] | Multifamily [Member]
Loans [Line Items]
Total past due loans		60
Current	24,954	9,813
Total loans	24,954	9,873
Non- accrual		22
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total past due loans	8,221	2,539
Current	1,066,475	890,350
Total loans	1,074,696	892,889
Non- accrual	8,688	4,830
Total Loans [Member] | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total past due loans	855	547
Current	220,689	184,072
Total loans	221,544	184,619
Non- accrual	2,056	1,273
Total Loans [Member] | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total past due loans	28	3,490
Current	309,040	272,631
Total loans	309,068	276,121
Non- accrual	66	1,013
Total Loans [Member] | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total past due loans	28	4,097
Current	437,614	317,615
Total loans	437,642	321,712
Non- accrual	66	1,223
Total Loans [Member] | Non ASC 310-30 [Member] | Senior lien
Loans [Line Items]
Total past due loans	2,991	4,301
Current	672,699	610,192
Total loans	675,690	614,493
Loans 90 days past due and still accruing		124
Non- accrual	4,522	3,713
Total Loans [Member] | Non ASC 310-30 [Member] | Junior lien
Loans [Line Items]
Total past due loans	198	730
Current	52,473	47,327
Total loans	52,671	48,057
Loans 90 days past due and still accruing		6
Non- accrual	654	584
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total past due loans	16,127	10,611
Current	1,505,023	1,359,335
Total loans	1,521,150	1,369,946
Non- accrual	25,294	20,095
Total Loans [Member] | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total past due loans	501	1,721
Current	134,136	143,837
Total loans	134,637	145,558
Non- accrual	1,905	1,984
Total Loans [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]
Loans [Line Items]
Total past due loans	6,550	5,804
Current	83,723	141,076
Total loans	90,273	146,880
Non- accrual	12,645	12,008
Total Loans [Member] | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total past due loans	3,189	5,031
Current	725,172	657,519
Total loans	728,361	662,550
Loans 90 days past due and still accruing		130
Non- accrual	5,176	4,297
Total Loans [Member] | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total past due loans	91	303
Current	27,825	30,332
Total loans	27,916	30,635
Loans 90 days past due and still accruing		36
Non- accrual	181	32
Total Loans [Member] | ASC 310-30 [Member]
Loans [Line Items]
Total loans	145,852	202,830
Total Loans [Member] | ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total loans	89,150	121,173
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total loans	39,280	57,474
Total Loans [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total loans	16,524	21,452
Total Loans [Member] | ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total loans	898	2,731
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member]
Loans [Line Items]
Total past due loans	5,306	8,232
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
Total past due loans		359
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total past due loans	3,134	2,252
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total past due loans	583	370
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total past due loans		2,340
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total past due loans		2,699
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member] | Senior lien
Loans [Line Items]
Total past due loans	888	1,909
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member] | Junior lien
Loans [Line Items]
Total past due loans	115	299
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total past due loans	4,220	3,086
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total past due loans	501	441
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member] | Energy Loans [Member]
Loans [Line Items]
Total past due loans	2	23
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total past due loans	1,003	2,208
Total Loans [Member] | 30-59 Days Past Due | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total past due loans	83	239
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member]
Loans [Line Items]
Total past due loans	4,939	7,770
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Commercial Construction [Member]
Loans [Line Items]
Total past due loans		188
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Multifamily [Member]
Loans [Line Items]
Total past due loans		38
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total past due loans	4,009	238
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total past due loans	216	111
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total past due loans		182
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total past due loans		408
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Senior lien
Loans [Line Items]
Total past due loans	645	911
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Junior lien
Loans [Line Items]
Total past due loans	61	237
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total past due loans	4,225	6,188
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total past due loans		58
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Energy Loans [Member]
Loans [Line Items]
Total past due loans		5,781
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total past due loans	706	1,148
Total Loans [Member] | 60-89 Days Past Due | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total past due loans	8	26
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member]
Loans [Line Items]
Total past due loans	9,190	4,040
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member] | Multifamily [Member]
Loans [Line Items]
Total past due loans		22
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total past due loans	1,078	49
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total past due loans	56	66
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total past due loans	28	968
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member] | Total Commercial Real Estate [Member]
Loans [Line Items]
Total past due loans	28	990
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member] | Senior lien
Loans [Line Items]
Total past due loans	1,458	1,481
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member] | Junior lien
Loans [Line Items]
Total past due loans	22	194
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total past due loans	7,682	1,337
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member] | Agriculture [Member]
Loans [Line Items]
Total past due loans		1,222
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member] | Energy Loans [Member]
Loans [Line Items]
Total past due loans	6,548
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total past due loans	1,480	1,675
Total Loans [Member] | Greater than 90 Days Past Due | Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total past due loans		$ 38
Non Accrual [Member]
Loans [Line Items]
Non- accrual	30,700
Non Accrual [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Non- accrual	6,600
Non Accrual [Member] | Energy Loans [Member]
Loans [Line Items]
Non- accrual	$ 12,600