Loans - Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	$ 2,633,758	$ 2,548,493
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	2,168,236	2,089,444
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	41,948	27,851
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	42,478	51,040
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	381,096	380,158
Residential Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	204,344	202,774
Residential Owner Occupied [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	8,741	9,419
Residential Owner Occupied [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	87	91
Residential Owner Occupied [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	3,400	3,130
Residential Owner Occupied [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Residential Owner Occupied [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	192,116	190,134
Residential Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	118,248	120,397
Residential Non Owner Occupied [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	109,285	109,885
Residential Non Owner Occupied [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	604	700
Residential Non Owner Occupied [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	2,691	3,087
Residential Non Owner Occupied [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Residential Non Owner Occupied [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	5,668	6,725
One to Four Family Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	322,592	323,171
One to Four Family Residential Real Estate [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	118,026	119,304
One to Four Family Residential Real Estate [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	691	791
One to Four Family Residential Real Estate [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	6,091	6,217
One to Four Family Residential Real Estate [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
One to Four Family Residential Real Estate [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	197,784	196,859
Multi Family Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	282,067	278,748
Multi Family Residential Real Estate [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	281,210	276,594
Multi Family Residential Real Estate [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Multi Family Residential Real Estate [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	751	2,047
Multi Family Residential Real Estate [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Multi Family Residential Real Estate [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	106	107
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	410,058	417,368
Commercial Real Estate Owner Occupied [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	388,488	402,008
Commercial Real Estate Owner Occupied [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	13,825	5,724
Commercial Real Estate Owner Occupied [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	7,668	9,547
Commercial Real Estate Owner Occupied [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Commercial Real Estate Owner Occupied [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	77	89
Commercial Real Estate Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	550,325	534,946
Commercial Real Estate Non Owner Occupied [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	542,751	529,842
Commercial Real Estate Non Owner Occupied [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	4,963	2,807
Commercial Real Estate Non Owner Occupied [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	2,611	2,297
Commercial Real Estate Non Owner Occupied [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Commercial Real Estate Non Owner Occupied [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Agriculture Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	127,355	131,976
Agriculture Land [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	110,181	111,595
Agriculture Land [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	2,253	4,023
Agriculture Land [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	14,921	16,358
Agriculture Land [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Agriculture Land [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Commercial Real Estate Other Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	45,786	45,245
Commercial Real Estate Other Receivable [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	43,374	42,189
Commercial Real Estate Other Receivable [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	579	730
Commercial Real Estate Other Receivable [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	843	1,244
Commercial Real Estate Other Receivable [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Commercial Real Estate Other Receivable [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	990	1,082
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	1,133,524	1,129,535
Commercial Real Estate [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	1,084,794	1,085,634
Commercial Real Estate [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	21,620	13,284
Commercial Real Estate [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	26,043	29,446
Commercial Real Estate [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Commercial Real Estate [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	1,067	1,171
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	200,767	142,096
Construction Loans [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	178,822	122,775
Construction Loans [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	1,603	219
Construction Loans [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Construction Loans [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Construction Loans [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	20,342	19,102
Commercial Working Capital [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	237,168	221,938
Commercial Working Capital [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	220,234	205,903
Commercial Working Capital [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	10,006	6,546
Commercial Working Capital [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	6,928	9,489
Commercial Working Capital [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Commercial Working Capital [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Commercial Loans Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	295,340	289,446
Commercial Loans Other [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	285,150	279,234
Commercial Loans Other [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	8,028	7,011
Commercial Loans Other [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	2,162	3,201
Commercial Loans Other [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Commercial Loans Other [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	532,508	511,384
Commercial [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	505,384	485,137
Commercial [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	18,034	13,557
Commercial [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	9,090	12,690
Commercial [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Commercial [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Home Equity and Home Improvement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	126,802	129,028
Home Equity and Home Improvement [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Home Equity and Home Improvement [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Home Equity and Home Improvement [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	422	434
Home Equity and Home Improvement [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Home Equity and Home Improvement [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	126,380	128,594
Consumer Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	35,498	34,531
Consumer Finance [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Consumer Finance [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Consumer Finance [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	81	206
Consumer Finance [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	0	0
Consumer Finance [Member] | Not Graded [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Net	$ 35,417	$ 34,325