Loans (Details 6) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	$ 2,359,038	$ 2,343,042
Total Past Due	7,133	13,447
Total Non Accrual	27,915	30,703
Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	2,860	5,326
Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	467	3,098
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	3,806	5,023
Residential Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	177,799	175,139
Total Past Due	1,729	3,081
Total Non Accrual	2,111	2,510
Residential Owner Occupied [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	537	821
Residential Owner Occupied [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	259	1,033
Residential Owner Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	933	1,227
Residential Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	96,275	96,400
Total Past Due	173	736
Total Non Accrual	342	520
Residential Non Owner Occupied [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	76	495
Residential Non Owner Occupied [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	8
Residential Non Owner Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	97	233
One To Four Family Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	274,074	271,539
Total Past Due	1,902	3,817
Total Non Accrual	2,453	3,030
One To Four Family Residential Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	613	1,316
One To Four Family Residential Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	259	1,041
One To Four Family Residential Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,030	1,460
Multi Family Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	271,087	247,980
Total Past Due	0	422
Total Non Accrual	124	128
Multi Family Residential Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	422
Multi Family Residential Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Multi Family Residential Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	407,019	393,125
Total Past Due	1,515	1,651
Total Non Accrual	10,170	10,775
Commercial Real Estate Owner Occupied [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	592	195
Commercial Real Estate Owner Occupied [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	76	188
Commercial Real Estate Owner Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	847	1,268
Commercial Real Estate Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	424,247	403,656
Total Past Due	1,366	516
Total Non Accrual	2,164	2,431
Commercial Real Estate Non Owner Occupied [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,074	1
Commercial Real Estate Non Owner Occupied [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	29	91
Commercial Real Estate Non Owner Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	263	424
Agriculture Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	130,940	131,753
Total Past Due	290	478
Total Non Accrual	4,275	4,144
Agriculture Land [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	82	412
Agriculture Land [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Agriculture Land [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	208	66
Commercial Real Estate Other Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	48,868	58,784
Total Past Due	112	217
Total Non Accrual	611	734
Commercial Real Estate Other Receivable [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	13	13
Commercial Real Estate Other Receivable [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Real Estate Other Receivable [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	99	204
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,011,074	987,318
Total Past Due	3,283	2,862
Total Non Accrual	17,220	18,084
Commercial Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,761	621
Commercial Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	105	279
Commercial Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,417	1,962
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	140,221	149,174
Total Past Due	0	0
Total Non Accrual	0	0
Construction [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Construction [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Construction [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Working Capital Or Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	229,844	233,632
Total Past Due	309	2,242
Total Non Accrual	3,550	2,369
Commercial Working Capital Or Other [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	209	102
Commercial Working Capital Or Other [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	1,264
Commercial Working Capital Or Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	100	876
Commercial Loans Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	271,422	291,455
Total Past Due	687	599
Total Non Accrual	3,620	6,474
Commercial Loans Other [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	49	82
Commercial Loans Other [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Loans Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	638	517
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	501,266	525,087
Total Past Due	996	2,841
Total Non Accrual	7,170	8,843
Commercial Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	258	184
Commercial Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	1,264
Commercial Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	738	1,393
Consumer Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	27,764	28,800
Total Past Due	334	375
Total Non Accrual	39	27
Consumer Finance [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	199	293
Consumer Finance [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	96	80
Consumer Finance [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	39	2
Home Equity and Improvement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	133,552	133,144
Total Past Due	618	3,130
Total Non Accrual	909	591
Home Equity and Improvement [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	29	2,490
Home Equity and Improvement [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	7	434
Home Equity and Improvement [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 582	$ 206