Regulatory Matters (Schedule of Actual Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Ratio	11.90%	12.20%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%
Tier 1 Capital to Risk Weighted Assets, Ratio	9.70%	10.00%
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	8.60%	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	8.90%	9.10%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%
Lake Forest Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 348,058	$ 272,921
Total Capital to Risk Weighted Assets, Ratio	11.70%	10.90%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 296,573	$ 251,560
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	$ 331,883	$ 256,126
Tier 1 Capital to Risk Weighted Assets, Ratio	11.20%	10.20%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 237,259	$ 201,248
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 331,883	$ 256,126
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	11.20%	10.20%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 192,773	$ 163,514
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 331,883	$ 256,126
Tier 1 Leverage Ratio, Ratio	9.60%	9.10%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 172,160	$ 140,541
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Hinsdale Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 211,605	$ 200,436
Total Capital to Risk Weighted Assets, Ratio	11.70%	12.10%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 180,470	$ 165,157
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	$ 201,353	$ 191,553
Tier 1 Capital to Risk Weighted Assets, Ratio	11.20%	11.60%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 144,376	$ 132,125
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 201,353	$ 191,553
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	11.20%	11.60%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 117,305	$ 107,352
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 201,353	$ 191,553
Tier 1 Leverage Ratio, Ratio	10.10%	9.90%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 100,006	$ 97,023
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Wintrust Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 441,330	$ 364,015
Total Capital to Risk Weighted Assets, Ratio	11.20%	10.90%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 393,081	$ 334,596
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	$ 375,907	$ 311,322
Tier 1 Capital to Risk Weighted Assets, Ratio	9.60%	9.30%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 314,464	$ 267,677
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 375,907	$ 311,322
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	9.60%	9.30%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 255,502	$ 217,488
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 375,907	$ 311,322
Tier 1 Leverage Ratio, Ratio	9.20%	8.90%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 204,994	$ 174,117
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Libertyville Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 133,571	$ 124,665
Total Capital to Risk Weighted Assets, Ratio	11.40%	11.50%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 117,620	$ 108,619
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	$ 126,387	$ 117,965
Tier 1 Capital to Risk Weighted Assets, Ratio	10.70%	10.90%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 94,096	$ 86,895
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 126,387	$ 117,965
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	10.70%	10.90%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 76,453	$ 70,603
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 126,387	$ 117,965
Tier 1 Leverage Ratio, Ratio	9.70%	9.60%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 65,318	$ 61,320
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Barrington Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 205,766	$ 187,062
Total Capital to Risk Weighted Assets, Ratio	11.50%	11.30%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 178,846	$ 165,810
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	$ 198,545	$ 176,489
Tier 1 Capital to Risk Weighted Assets, Ratio	11.10%	10.60%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 143,077	$ 132,648
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 198,545	$ 176,489
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	11.10%	10.60%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 116,250	$ 107,777
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 198,545	$ 176,489
Tier 1 Leverage Ratio, Ratio	10.00%	9.80%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 99,722	$ 90,168
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Crystal Lake Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 93,905	$ 89,476
Total Capital to Risk Weighted Assets, Ratio	11.80%	11.90%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 79,829	$ 75,314
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	$ 89,700	$ 85,521
Tier 1 Capital to Risk Weighted Assets, Ratio	11.20%	11.40%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 63,863	$ 60,251
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 89,700	$ 85,521
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	11.20%	11.40%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 51,889	$ 48,954
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 89,700	$ 85,521
Tier 1 Leverage Ratio, Ratio	9.40%	9.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 47,575	$ 45,445
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Northbrook Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 190,853	$ 138,890
Total Capital to Risk Weighted Assets, Ratio	11.10%	10.50%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 171,647	$ 132,200
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	$ 167,721	$ 129,514
Tier 1 Capital to Risk Weighted Assets, Ratio	9.80%	9.80%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 105,760	$ 105,760
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 167,721	$ 129,514
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	9.80%	9.80%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 85,930	$ 85,930
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 167,721	$ 129,514
Tier 1 Leverage Ratio, Ratio	8.90%	8.60%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 94,466	$ 75,287
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Schaumburg Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 106,108	$ 78,682
Total Capital to Risk Weighted Assets, Ratio	11.50%	10.30%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 92,496	$ 76,422
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	$ 100,854	$ 71,958
Tier 1 Capital to Risk Weighted Assets, Ratio	10.90%	9.40%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 73,997	$ 61,137
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 100,854	$ 71,958
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	10.90%	9.40%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 60,123	$ 49,674
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 100,854	$ 71,958
Tier 1 Leverage Ratio, Ratio	10.00%	8.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 50,643	$ 42,707
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Village Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 136,958	$ 115,043
Total Capital to Risk Weighted Assets, Ratio	11.20%	11.00%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 122,125	$ 105,027
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	$ 127,028	$ 108,221
Tier 1 Capital to Risk Weighted Assets, Ratio	10.40%	10.30%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 97,700	$ 84,021
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 127,028	$ 108,221
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	10.40%	10.30%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 79,381	$ 68,267
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 127,028	$ 108,221
Tier 1 Leverage Ratio, Ratio	9.10%	9.20%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 69,511	$ 58,817
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Beverly Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 115,638	$ 79,843
Total Capital to Risk Weighted Assets, Ratio	11.40%	9.60%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 101,235	$ 83,442
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	$ 111,281	$ 76,708
Tier 1 Capital to Risk Weighted Assets, Ratio	11.00%	9.20%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 80,988	$ 66,754
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 111,281	$ 76,708
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	11.00%	9.20%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 65,802	$ 54,237
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 111,281	$ 76,708
Tier 1 Leverage Ratio, Ratio	10.10%	8.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 55,002	$ 45,757
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Town Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 181,907	$ 159,508
Total Capital to Risk Weighted Assets, Ratio	11.30%	12.00%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 161,492	$ 133,344
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	$ 174,234	$ 153,902
Tier 1 Capital to Risk Weighted Assets, Ratio	10.80%	11.50%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 129,194	$ 106,675
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 174,234	$ 153,902
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	10.80%	11.50%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 104,970	$ 86,674
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 174,234	$ 153,902
Tier 1 Leverage Ratio, Ratio	9.50%	10.30%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 91,558	$ 74,452
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Wheaton Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 130,255	$ 103,873
Total Capital to Risk Weighted Assets, Ratio	11.30%	10.10%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 114,887	$ 102,479
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	$ 112,664	$ 96,799
Tier 1 Capital to Risk Weighted Assets, Ratio	9.80%	9.50%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 91,910	$ 81,983
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 112,664	$ 96,799
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	9.80%	9.50%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 74,677	$ 66,611
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 112,664	$ 96,799
Tier 1 Leverage Ratio, Ratio	8.80%	8.10%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 64,361	$ 59,482
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
State Bank of the Lakes
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 97,196	$ 85,988
Total Capital to Risk Weighted Assets, Ratio	11.50%	10.60%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 84,880	$ 80,923
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	$ 86,092	$ 76,609
Tier 1 Capital to Risk Weighted Assets, Ratio	10.10%	9.50%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 67,904	$ 64,738
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 86,092	$ 76,609
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	10.10%	9.50%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 55,172	$ 52,600
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 86,092	$ 76,609
Tier 1 Leverage Ratio, Ratio	8.70%	8.30%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 49,446	$ 46,001
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
Old Plank Trail Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 127,868	$ 110,058
Total Capital to Risk Weighted Assets, Ratio	11.20%	11.30%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 114,021	$ 97,223
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	$ 122,067	$ 100,506
Tier 1 Capital to Risk Weighted Assets, Ratio	10.70%	10.30%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 91,216	$ 77,778
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 122,067	$ 100,506
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	10.70%	10.30%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 74,113	$ 63,195
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 122,067	$ 100,506
Tier 1 Leverage Ratio, Ratio	9.30%	8.50%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 65,293	$ 59,383
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%
St. Charles Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 109,345	$ 79,024
Total Capital to Risk Weighted Assets, Ratio	12.00%	10.90%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 91,188	$ 72,812
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	$ 104,843	$ 75,348
Tier 1 Capital to Risk Weighted Assets, Ratio	11.50%	10.40%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 72,950	$ 58,250
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 104,843	$ 75,348
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio	11.50%	10.40%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 59,272	$ 47,328
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%	6.50%
Tier 1 Leverage Ratio, Amount	$ 104,843	$ 75,348
Tier 1 Leverage Ratio, Ratio	11.20%	9.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 46,641	$ 39,942
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%