Loans, Receivables Past Due (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Non performing loans [Abstract]
90+ and Still Accruing		$ 0	$ 0
Non-Accrual		9,343	8,184
Total Non-performing Loans		9,343	8,184
Accrued interest included in recorded investment		0	0
Aging analysis of loans by class [Abstract]
Total		15,151	12,554
Loans not Past Due		2,555,802	2,012,764
Total loans recorded investment		2,570,953	2,025,318
Accrued interest included in recorded investment		8,375	6,501
Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		4,709	3,671
Accrued interest included in recorded investment		53	43
Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		1,243	1,271
Accrued interest included in recorded investment		21	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		9,199	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		74	65
Loans Not Past Due [Member]
Aging analysis of loans by class [Abstract]
Accrued interest included in recorded investment		8,301	6,436
Commercial [Member]
Aging analysis of loans by class [Abstract]
Total loans recorded investment		1,115,227	855,560
Accrued interest included in recorded investment		3,126	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		32	30
Loans not Past Due		378,201	290,466
Total loans recorded investment		378,233	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		32	0
Commercial [Member] | Income Producing - Real Estate [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		0	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		61,760	70,182
Total loans recorded investment		64,162	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		0	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		2,402	0
Commercial [Member] | Commercial and Industrial [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		380	607
Total Non-performing Loans		380	607
Aging analysis of loans by class [Abstract]
Total		957	104
Loans not Past Due		671,875	494,769
Total loans recorded investment		672,832	494,873
Commercial [Member] | Commercial and Industrial [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		881	60
Commercial [Member] | Commercial and Industrial [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		25	0
Commercial [Member] | Commercial and Industrial [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		51	44
Mortgage [Member]
Aging analysis of loans by class [Abstract]
Total loans recorded investment		1,060,648	852,808
Accrued interest included in recorded investment	[1]	4,166	3,278
Mortgage [Member] | 1-4 Family [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		4,159	5,130
Total Non-performing Loans		4,159	5,130
Aging analysis of loans by class [Abstract]
Total		7,177	7,491
Loans not Past Due		844,584	659,742
Total loans recorded investment		851,761	667,233
Accrued interest included in recorded investment	[1]	3,161	2,456
Mortgage [Member] | 1-4 Family [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		2,146	1,559
Mortgage [Member] | 1-4 Family [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		687	802
Mortgage [Member] | 1-4 Family [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		4,344	5,130
Mortgage [Member] | Resort Lending [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		969	1,223
Total Non-performing Loans		969	1,223
Aging analysis of loans by class [Abstract]
Total		1,387	1,936
Loans not Past Due		83,420	88,620
Total loans recorded investment		84,807	90,556
Accrued interest included in recorded investment	[1]	360	371
Mortgage [Member] | Resort Lending [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		418	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		969	1,223
Mortgage [Member] | Home Equity - 1st Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		324	326
Total Non-performing Loans		324	326
Aging analysis of loans by class [Abstract]
Total		420	672
Loans not Past Due		40,312	34,689
Total loans recorded investment		40,732	35,361
Accrued interest included in recorded investment	[1]	206	157
Mortgage [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		81	308
Mortgage [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		15	38
Mortgage [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		324	326
Mortgage [Member] | Home Equity - 2nd Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		353	316
Total Non-performing Loans		353	316
Aging analysis of loans by class [Abstract]
Total		926	824
Loans not Past Due		82,422	58,834
Total loans recorded investment		83,348	59,658
Accrued interest included in recorded investment	[1]	439	294
Mortgage [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		364	353
Mortgage [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		209	155
Mortgage [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		353	316
Installment [Member]
Aging analysis of loans by class [Abstract]
Total loans recorded investment		395,078	316,950
Accrued interest included in recorded investment	[2]	1,083	923
Installment [Member] | Home Equity - 1st Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		225	141
Total Non-performing Loans		225	141
Aging analysis of loans by class [Abstract]
Total		554	242
Loans not Past Due		7,738	9,213
Total loans recorded investment		8,292	9,455
Accrued interest included in recorded investment	[2]	33	39
Installment [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		285	90
Installment [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		44	11
Installment [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		225	141
Installment [Member] | Home Equity - 2nd Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		246	159
Total Non-performing Loans		246	159
Aging analysis of loans by class [Abstract]
Total		481	470
Loans not Past Due		7,099	9,001
Total loans recorded investment		7,580	9,471
Accrued interest included in recorded investment	[2]	27	43
Installment [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		190	217
Installment [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		45	94
Installment [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		246	159
Installment [Member] | Boat Lending [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		64	100
Total Non-performing Loans		64	100
Aging analysis of loans by class [Abstract]
Total		233	195
Loans not Past Due		169,925	129,777
Total loans recorded investment		170,158	129,972
Accrued interest included in recorded investment	[2]	431	346
Installment [Member] | Boat Lending [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		153	59
Installment [Member] | Boat Lending [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		16	36
Installment [Member] | Boat Lending [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		64	100
Installment [Member] | Recreational Vehicle Lending [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		8	25
Total Non-performing Loans		8	25
Aging analysis of loans by class [Abstract]
Total		84	73
Loans not Past Due		123,199	92,737
Total loans recorded investment		123,283	92,810
Accrued interest included in recorded investment	[2]	319	254
Installment [Member] | Recreational Vehicle Lending [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		46	28
Installment [Member] | Recreational Vehicle Lending [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		30	20
Installment [Member] | Recreational Vehicle Lending [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		8	25
Installment [Member] | Other [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		213	118
Total Non-performing Loans		213	118
Aging analysis of loans by class [Abstract]
Total		498	508
Loans not Past Due		85,267	74,734
Total loans recorded investment		85,765	75,242
Accrued interest included in recorded investment	[2]	273	241
Installment [Member] | Other [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		145	275
Installment [Member] | Other [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		140	115
Installment [Member] | Other [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		$ 213	$ 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.