Loans, Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Impaired loans with no allocated allowance for loan losses [Abstract]
Troubled debt restructurings ("TDR")	$ 280		$ 280		$ 337
Non - TDR	1,542		1,542		1,550
Impaired loans with an allocated allowance for loan losses [Abstract]
TDR - allowance based on collateral	15,221		15,221		1,587
TDR - allowance based on present value cash flow	40,282		40,282		48,798
Non - TDR - allowance based on collateral	5,572		5,572		3,365
Total impaired loans	62,897		62,897		55,637
Amount of allowance for loan losses allocated [Abstract]
TDR - allowance based on collateral	2,166		2,166		542
TDR - allowance based on present value cash flow	3,960		3,960		4,641
Non - TDR - allowance based on collateral	1,234		1,234		972
Total amount of allowance for loan losses allocated	7,360		7,360		6,155
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	1,825		1,825		1,887
Unpaid Principal Balance, with no related allowance for loan losses recorded	2,008		2,008		2,115
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	61,413		61,413		54,005
Unpaid Principal Balance, with an allowance for loan losses recorded	68,254		68,254		56,708
Recorded Investment	63,238		63,238		55,892
Unpaid Principal Balance	70,262		70,262		58,823
Related Allowance	7,360		7,360		6,155
Accrued interest included in recorded investment	341		341		255
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	1,688	$ 484	1,688	$ 324
Interest Income Recognized, with no related allowance for loan losses recorded	5	2	9	2
Average Recorded Investment, with an allowance for loan losses recorded	61,585	56,119	59,057	56,898
Interest Income Recognized, with an allowance for loan losses recorded	782	708	1,664	1,473
Average Recorded Investment	63,273	56,603	60,745	57,222
Interest Income Recognized	787	710	1,673	1,475
Commercial [Member] | Commercial and Industrial [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	84		84		257
Unpaid Principal Balance, with no related allowance for loan losses recorded	84		84		257
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	2,409		2,409		1,655
Unpaid Principal Balance, with an allowance for loan losses recorded	2,510		2,510		1,706
Recorded Investment	2,493		2,493		1,912
Unpaid Principal Balance	2,594		2,594		1,963
Related Allowance	653		653		453
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	84	0	142	0
Interest Income Recognized, with no related allowance for loan losses recorded	1	0	2	0
Average Recorded Investment, with an allowance for loan losses recorded	2,409	2,418	2,158	2,824
Interest Income Recognized, with an allowance for loan losses recorded	29	16	67	36
Average Recorded Investment	2,493	2,418	2,300	2,824
Interest Income Recognized	30	16	69	36
Commercial [Member] | Commercial Real Estate [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		796
Unpaid Principal Balance, with no related allowance for loan losses recorded	0		0		796
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	16,420		16,420		6,685
Unpaid Principal Balance, with an allowance for loan losses recorded	20,934		20,934		6,661
Recorded Investment	16,420		16,420		7,481
Unpaid Principal Balance	20,934		20,934		7,457
Related Allowance	2,115		2,115		578
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	0	199	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	15,988	5,587	12,887	5,411
Interest Income Recognized, with an allowance for loan losses recorded	288	83	511	150
Average Recorded Investment	15,988	5,587	13,086	5,411
Interest Income Recognized	288	83	511	150
Mortgage [Member] | 1-4 Family Owner Occupied - Jumbo [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	632		632		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	632		632		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	525		525		1,447
Unpaid Principal Balance, with an allowance for loan losses recorded	887		887		1,445
Recorded Investment	1,157		1,157		1,447
Unpaid Principal Balance	1,519		1,519		1,445
Related Allowance	52		52		91
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	316	0	211	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	1,187	633	1,273	1,106
Interest Income Recognized, with an allowance for loan losses recorded	11	10	28	37
Average Recorded Investment	1,503	633	1,484	1,106
Interest Income Recognized	11	10	28	37
Mortgage [Member] | 1-4 Family Owner Occupied - Non-jumbo [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	424		424		212
Unpaid Principal Balance, with no related allowance for loan losses recorded	448		448		217
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	22,334		22,334		10,163
Unpaid Principal Balance, with an allowance for loan losses recorded	23,092		23,092		10,695
Recorded Investment	22,758		22,758		10,375
Unpaid Principal Balance	23,540		23,540		10,912
Related Allowance	2,462		2,462		1,031
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	482	180	392	120
Interest Income Recognized, with no related allowance for loan losses recorded	1	2	4	2
Average Recorded Investment, with an allowance for loan losses recorded	22,249	12,343	18,220	19,683
Interest Income Recognized, with an allowance for loan losses recorded	273	155	624	511
Average Recorded Investment	22,731	12,523	18,612	19,803
Interest Income Recognized	274	157	628	513
Mortgage [Member] | 1-4 Non-owner Occupied [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	321		321		214
Unpaid Principal Balance, with no related allowance for loan losses recorded	480		480		366
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	4,942		4,942		4,962
Unpaid Principal Balance, with an allowance for loan losses recorded	5,401		5,401		5,542
Recorded Investment	5,263		5,263		5,176
Unpaid Principal Balance	5,881		5,881		5,908
Related Allowance	543		543		572
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	355	304	308	204
Interest Income Recognized, with no related allowance for loan losses recorded	3	0	3	0
Average Recorded Investment, with an allowance for loan losses recorded	4,774	18,510	4,837	11,171
Interest Income Recognized, with an allowance for loan losses recorded	52	251	118	315
Average Recorded Investment	5,129	18,814	5,145	11,375
Interest Income Recognized	55	251	121	315
Mortgage [Member] | 1-4 Family - 2nd Lien [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	364		364		407
Unpaid Principal Balance, with no related allowance for loan losses recorded	364		364		438
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	575		575		14,059
Unpaid Principal Balance, with an allowance for loan losses recorded	579		579		15,243
Recorded Investment	939		939		14,466
Unpaid Principal Balance	943		943		15,681
Related Allowance	116		116		1,695
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	374	0	385	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	694	556	5,149	423
Interest Income Recognized, with an allowance for loan losses recorded	2	3	6	6
Average Recorded Investment	1,068	556	5,534	423
Interest Income Recognized	2	3	6	6
Mortgage [Member] | Resort Lending [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	0		0		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	11,563		11,563		12,110
Unpaid Principal Balance, with an allowance for loan losses recorded	12,017		12,017		12,263
Recorded Investment	11,563		11,563		12,110
Unpaid Principal Balance	12,017		12,017		12,263
Related Allowance	1,165		1,165		1,474
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	77	0	51	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	11,554	12,680	11,739	12,896
Interest Income Recognized, with an allowance for loan losses recorded	92	147	233	322
Average Recorded Investment	11,631	12,680	11,790	12,896
Interest Income Recognized	92	147	233	322
Installment [Member] | Boat Lending [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	0		0		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	72		72		0
Unpaid Principal Balance, with an allowance for loan losses recorded	99		99		0
Recorded Investment	72		72		0
Unpaid Principal Balance	99		99		0
Related Allowance	25		25		0
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	0	0	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	74	67	49	44
Interest Income Recognized, with an allowance for loan losses recorded	0	0	0	0
Average Recorded Investment	74	67	49	44
Interest Income Recognized	0	0	0	0
Installment [Member] | Recreational Vehicle Lending [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	0		0		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	90		90		0
Unpaid Principal Balance, with an allowance for loan losses recorded	105		105		0
Recorded Investment	90		90		0
Unpaid Principal Balance	105		105		0
Related Allowance	19		19		0
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	0	0	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	110	67	73	71
Interest Income Recognized, with an allowance for loan losses recorded	0	0	1	1
Average Recorded Investment	110	67	73	71
Interest Income Recognized	0	0	1	1
Installment [Member] | Other [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		1
Unpaid Principal Balance, with no related allowance for loan losses recorded	0		0		41
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	2,483		2,483		2,924
Unpaid Principal Balance, with an allowance for loan losses recorded	2,630		2,630		3,153
Recorded Investment	2,483		2,483		2,925
Unpaid Principal Balance	2,630		2,630		3,194
Related Allowance	210		210		$ 261
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	0	0	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	2,546	3,258	2,672	3,269
Interest Income Recognized, with an allowance for loan losses recorded	35	43	76	95
Average Recorded Investment	2,546	3,258	2,672	3,269
Interest Income Recognized	$ 35	$ 43	$ 76	$ 95