Loans, Receivables Past Due (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Non performing loans [Abstract]
90+ and Still Accruing		$ 0	$ 0
Non-Accrual		9,082	8,184
Total Non-performing Loans		9,082	8,184
Accrued interest included in recorded investment		0	0
Aging analysis of loans by class [Abstract]
Total		15,093	12,554
Loans not Past Due		2,460,341	2,012,764
Total loans recorded investment		2,475,434	2,025,318
Accrued interest included in recorded investment		8,117	6,501
Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		7,433	3,671
Accrued interest included in recorded investment		62	43
Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		1,408	1,271
Accrued interest included in recorded investment		20	22
Loans Past Due, 90+ days [Member]
Non performing loans [Abstract]
Accrued interest included in recorded investment		0	0
Aging analysis of loans by class [Abstract]
Total		6,252	7,612
Accrued interest included in recorded investment		0	0
Loans Past Due Total [Member]
Aging analysis of loans by class [Abstract]
Accrued interest included in recorded investment		82	65
Loans Not Past Due [Member]
Aging analysis of loans by class [Abstract]
Accrued interest included in recorded investment		8,035	6,436
Commercial [Member]
Aging analysis of loans by class [Abstract]
Total loans recorded investment		1,110,107	855,560
Accrued interest included in recorded investment		3,120	2,300
Commercial [Member] | Income Producing - Real Estate [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		0	30
Total Non-performing Loans		0	30
Aging analysis of loans by class [Abstract]
Total		293	30
Loans not Past Due		365,473	290,466
Total loans recorded investment		365,766	290,496
Commercial [Member] | Income Producing - Real Estate [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		0	0
Commercial [Member] | Income Producing - Real Estate [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		234	0
Commercial [Member] | Income Producing - Real Estate [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		59	30
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		2,402	9
Total Non-performing Loans		2,402	9
Aging analysis of loans by class [Abstract]
Total		2,402	9
Loans not Past Due		59,353	70,182
Total loans recorded investment		61,755	70,191
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		2,402	9
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		0	0
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		0	0
Commercial [Member] | Commercial and Industrial [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		487	607
Total Non-performing Loans		487	607
Aging analysis of loans by class [Abstract]
Total		415	104
Loans not Past Due		682,171	494,769
Total loans recorded investment		682,586	494,873
Commercial [Member] | Commercial and Industrial [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		266	60
Commercial [Member] | Commercial and Industrial [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		149	0
Commercial [Member] | Commercial and Industrial [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		0	44
Mortgage [Member]
Aging analysis of loans by class [Abstract]
Total loans recorded investment		992,611	852,808
Accrued interest included in recorded investment	[1]	3,989	3,278
Mortgage [Member] | 1-4 Family [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		3,737	5,130
Total Non-performing Loans		3,737	5,130
Aging analysis of loans by class [Abstract]
Total		7,112	7,491
Loans not Past Due		776,934	659,742
Total loans recorded investment		784,046	667,233
Accrued interest included in recorded investment	[1]	2,889	2,456
Mortgage [Member] | 1-4 Family [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		2,583	1,559
Mortgage [Member] | 1-4 Family [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		792	802
Mortgage [Member] | 1-4 Family [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		3,737	5,130
Mortgage [Member] | Resort Lending [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		1,098	1,223
Total Non-performing Loans		1,098	1,223
Aging analysis of loans by class [Abstract]
Total		1,610	1,936
Loans not Past Due		82,706	88,620
Total loans recorded investment		84,316	90,556
Accrued interest included in recorded investment	[1]	364	371
Mortgage [Member] | Resort Lending [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		512	713
Mortgage [Member] | Resort Lending [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		0	0
Mortgage [Member] | Resort Lending [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		1,098	1,223
Mortgage [Member] | Home Equity - 1st Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		409	326
Total Non-performing Loans		409	326
Aging analysis of loans by class [Abstract]
Total		844	672
Loans not Past Due		44,440	34,689
Total loans recorded investment		45,284	35,361
Accrued interest included in recorded investment	[1]	262	157
Mortgage [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		435	308
Mortgage [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		0	38
Mortgage [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		409	326
Mortgage [Member] | Home Equity - 2nd Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		278	316
Total Non-performing Loans		278	316
Aging analysis of loans by class [Abstract]
Total		790	824
Loans not Past Due		78,175	58,834
Total loans recorded investment		78,965	59,658
Accrued interest included in recorded investment	[1]	474	294
Mortgage [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		440	353
Mortgage [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		72	155
Mortgage [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		278	316
Installment [Member]
Aging analysis of loans by class [Abstract]
Total loans recorded investment		372,716	316,950
Accrued interest included in recorded investment	[2]	1,008	923
Installment [Member] | Home Equity - 1st Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		150	141
Total Non-performing Loans		150	141
Aging analysis of loans by class [Abstract]
Total		636	242
Loans not Past Due		8,486	9,213
Total loans recorded investment		9,122	9,455
Accrued interest included in recorded investment	[2]	37	39
Installment [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		435	90
Installment [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		51	11
Installment [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		150	141
Installment [Member] | Home Equity - 2nd Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		297	159
Total Non-performing Loans		297	159
Aging analysis of loans by class [Abstract]
Total		461	470
Loans not Past Due		7,942	9,001
Total loans recorded investment		8,403	9,471
Accrued interest included in recorded investment	[2]	36	43
Installment [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		134	217
Installment [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		30	94
Installment [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		297	159
Installment [Member] | Boat Lending [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		107	100
Total Non-performing Loans		107	100
Aging analysis of loans by class [Abstract]
Total		128	195
Loans not Past Due		159,158	129,777
Total loans recorded investment		159,286	129,972
Accrued interest included in recorded investment	[2]	394	346
Installment [Member] | Boat Lending [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		19	59
Installment [Member] | Boat Lending [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		2	36
Installment [Member] | Boat Lending [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		107	100
Installment [Member] | Recreational Vehicle Lending [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		14	25
Total Non-performing Loans		14	25
Aging analysis of loans by class [Abstract]
Total		101	73
Loans not Past Due		113,097	92,737
Total loans recorded investment		113,198	92,810
Accrued interest included in recorded investment	[2]	288	254
Installment [Member] | Recreational Vehicle Lending [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		45	28
Installment [Member] | Recreational Vehicle Lending [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		42	20
Installment [Member] | Recreational Vehicle Lending [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		14	25
Installment [Member] | Other [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		103	118
Total Non-performing Loans		103	118
Aging analysis of loans by class [Abstract]
Total		301	508
Loans not Past Due		82,406	74,734
Total loans recorded investment		82,707	75,242
Accrued interest included in recorded investment	[2]	253	241
Installment [Member] | Other [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		162	275
Installment [Member] | Other [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		36	115
Installment [Member] | Other [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		$ 103	$ 118

[1] Other than for the TCSB Bancorp, Inc. ("TCSB") acquired loans, credit scores have been updated within the last twelve months.

[2] Other than for the TCSB acquired loans, credit scores have been updated within the last twelve months.