Regulatory Matters (Schedule of Actual Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Ratio	12.20%	13.00%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%
Tier 1 Capital to Risk Weighted Assets, Ratio	10.00%	11.60%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	8.40%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Ratio	9.10%	10.20%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%
Lake Forest Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 282,921	$ 245,248
Total Capital to Risk Weighted Assets, Ratio	11.30%	10.90%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 251,560	$ 224,354
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 256,126	$ 231,448
Tier 1 Capital to Risk Weighted Assets, Ratio	10.20%	10.30%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 201,248	$ 134,612
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 256,126
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	10.20%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 163,514
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 256,126	$ 231,448
Tier 1 Leverage Ratio, Ratio	9.10%	9.00%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 140,541	$ 128,590
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Hinsdale Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 200,436	$ 155,797
Total Capital to Risk Weighted Assets, Ratio	12.10%	11.40%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 165,157	$ 136,415
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 191,553	$ 146,290
Tier 1 Capital to Risk Weighted Assets, Ratio	11.60%	10.70%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 132,125	$ 81,849
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 191,553
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	11.60%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 107,352
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 191,553	$ 146,290
Tier 1 Leverage Ratio, Ratio	9.90%	9.70%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 97,023	$ 75,509
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Wintrust Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 377,015	$ 312,223
Total Capital to Risk Weighted Assets, Ratio	11.30%	11.20%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 334,596	$ 279,295
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 311,322	$ 222,845
Tier 1 Capital to Risk Weighted Assets, Ratio	9.30%	8.00%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 267,677	$ 167,577
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 311,322
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	9.30%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 217,488
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 311,322	$ 222,845
Tier 1 Leverage Ratio, Ratio	8.90%	7.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 174,117	$ 149,925
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Libertyville Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 124,665	$ 113,513
Total Capital to Risk Weighted Assets, Ratio	11.50%	11.40%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 108,619	$ 99,999
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 117,965	$ 107,649
Tier 1 Capital to Risk Weighted Assets, Ratio	10.90%	10.80%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 86,895	$ 59,999
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 117,965
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	10.90%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 70,603
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 117,965	$ 107,649
Tier 1 Leverage Ratio, Ratio	9.60%	9.30%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 61,320	$ 58,032
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Barrington Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 187,062	$ 163,162
Total Capital to Risk Weighted Assets, Ratio	11.30%	11.90%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 165,810	$ 137,527
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 176,489	$ 150,705
Tier 1 Capital to Risk Weighted Assets, Ratio	10.60%	11.00%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 132,648	$ 82,516
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 176,489
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	10.60%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 107,777
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 176,489	$ 150,705
Tier 1 Leverage Ratio, Ratio	9.80%	9.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 90,168	$ 80,086
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Crystal Lake Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 89,476	$ 87,138
Total Capital to Risk Weighted Assets, Ratio	11.90%	12.90%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 75,314	$ 67,482
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 85,521	$ 83,788
Tier 1 Capital to Risk Weighted Assets, Ratio	11.40%	12.40%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 60,251	$ 40,489
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 85,521
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	11.40%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 48,954
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 85,521	$ 83,788
Tier 1 Leverage Ratio, Ratio	9.40%	10.30%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 45,445	$ 40,502
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Northbrook Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 145,390	$ 126,325
Total Capital to Risk Weighted Assets, Ratio	11.00%	11.10%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 132,200	$ 114,042
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 129,514	$ 116,808
Tier 1 Capital to Risk Weighted Assets, Ratio	9.80%	10.20%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 105,760	$ 68,425
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 129,514
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	9.80%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 85,930
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 129,514	$ 116,808
Tier 1 Leverage Ratio, Ratio	8.60%	8.90%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 75,287	$ 65,626
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Schaumburg Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 87,182	$ 73,999
Total Capital to Risk Weighted Assets, Ratio	11.40%	11.30%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 76,422	$ 65,485
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 71,958	$ 67,427
Tier 1 Capital to Risk Weighted Assets, Ratio	9.40%	10.30%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 61,137	$ 39,291
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 71,958
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	9.40%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 49,674
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 71,958	$ 67,427
Tier 1 Leverage Ratio, Ratio	8.40%	8.90%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 42,707	$ 37,930
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Village Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 117,543	$ 103,148
Total Capital to Risk Weighted Assets, Ratio	11.20%	11.20%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 105,027	$ 92,110
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 108,221	$ 97,684
Tier 1 Capital to Risk Weighted Assets, Ratio	10.30%	10.60%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 84,021	$ 55,266
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 108,221
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	10.30%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 68,267
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 108,221	$ 97,684
Tier 1 Leverage Ratio, Ratio	9.20%	9.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 58,817	$ 51,753
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Beverly Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 92,843	$ 73,808
Total Capital to Risk Weighted Assets, Ratio	11.10%	11.30%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 83,442	$ 65,229
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 76,708	$ 71,197
Tier 1 Capital to Risk Weighted Assets, Ratio	9.20%	10.90%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 66,754	$ 39,137
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 76,708
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	9.20%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 54,237
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 76,708	$ 71,197
Tier 1 Leverage Ratio, Ratio	8.40%	9.30%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 45,757	$ 38,304
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Town Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 159,508	$ 130,699
Total Capital to Risk Weighted Assets, Ratio	12.00%	12.10%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 133,344	$ 108,434
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 153,902	$ 125,716
Tier 1 Capital to Risk Weighted Assets, Ratio	11.50%	11.60%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 106,675	$ 65,061
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 153,902
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	11.50%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 86,674
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 153,902	$ 125,716
Tier 1 Leverage Ratio, Ratio	10.30%	10.10%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 74,452	$ 62,283
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Wheaton Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 117,373	$ 77,366
Total Capital to Risk Weighted Assets, Ratio	11.50%	11.60%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 102,479	$ 66,920
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 96,799	$ 70,632
Tier 1 Capital to Risk Weighted Assets, Ratio	9.50%	10.60%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 81,983	$ 40,152
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 96,799
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	9.50%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 66,611
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 96,799	$ 70,632
Tier 1 Leverage Ratio, Ratio	8.10%	8.80%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 59,482	$ 40,152
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
State Bank Of The Lakes [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 89,488	$ 78,048
Total Capital to Risk Weighted Assets, Ratio	11.10%	11.60%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 80,923	$ 67,272
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 76,609	$ 69,176
Tier 1 Capital to Risk Weighted Assets, Ratio	9.50%	10.30%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 64,738	$ 40,363
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 76,609
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	9.50%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 52,600
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 76,609	$ 69,176
Tier 1 Leverage Ratio, Ratio	8.30%	8.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 46,001	$ 41,382
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Old Plank Trail Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 110,058	$ 100,082
Total Capital to Risk Weighted Assets, Ratio	11.30%	12.40%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 97,223	$ 80,420
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 100,506	$ 96,689
Tier 1 Capital to Risk Weighted Assets, Ratio	10.30%	12.00%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 77,778	$ 48,252
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 100,506
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	10.30%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 63,195
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 100,506	$ 96,689
Tier 1 Leverage Ratio, Ratio	8.50%	8.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 59,383	$ 57,717
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
St. Charles Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 81,524	$ 71,123
Total Capital to Risk Weighted Assets, Ratio	11.20%	11.10%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 72,812	$ 63,912
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%	10.00%
Tier 1 Capital to Risk Weighted Assets, Amount	$ 75,348	$ 67,588
Tier 1 Capital to Risk Weighted Assets, Ratio	10.40%	10.60%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 58,250	$ 38,347
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	6.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 75,348
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	10.40%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 47,328
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 Leverage Ratio, Amount	$ 75,348	$ 67,588
Tier 1 Leverage Ratio, Ratio	9.40%	9.80%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 39,942	$ 34,504
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%