Regulatory Matters (Schedule of Actual Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Ratio	12.20%	11.60%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	10.00%
Tier 1 Capital to Risk Weighted Assets, Ratio	9.60%	9.70%
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	9.20%	9.30%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	6.50%
Tier 1 leverage Ratio	8.70%	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	$ 461,643	$ 424,872
Total Capital to Risk Weighted Assets, Ratio	12.00%	12.50%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 386,358	$ 338,823
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	$ 440,585	$ 402,156
Tier 1 Capital to Risk Weighted Assets, Ratio	11.40%	11.90%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 309,087	$ 271,058
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	$ 440,585	$ 402,156
Common Equity Tier 1 capital to risk weighted assets	11.40%	11.90%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 251,133	$ 220,235
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	$ 440,585	$ 402,156
Tier 1 leverage Ratio	10.70%	10.70%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 223,497	$ 187,634
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	$ 339,158	$ 256,166
Total Capital to Risk Weighted Assets, Ratio	12.60%	11.90%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 268,915	$ 220,004
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	$ 328,046	$ 244,036
Tier 1 Capital to Risk Weighted Assets, Ratio	12.20%	11.30%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 215,132	$ 176,003
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	$ 328,046	$ 244,036
Common Equity Tier 1 capital to risk weighted assets	12.20%	11.30%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 174,795	$ 143,002
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	$ 328,046	$ 244,036
Tier 1 leverage Ratio	10.40%	10.40%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 147,512	$ 117,308
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	$ 709,328	$ 613,037
Total Capital to Risk Weighted Assets, Ratio	11.80%	11.50%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 602,969	$ 533,154
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	$ 668,922	$ 545,649
Tier 1 Capital to Risk Weighted Assets, Ratio	11.10%	10.20%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 482,375	$ 426,523
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	$ 668,922	$ 545,649
Common Equity Tier 1 capital to risk weighted assets	11.10%	10.20%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 391,930	$ 346,550
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	$ 668,922	$ 545,649
Tier 1 leverage Ratio	9.70%	9.70%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 324,017	$ 281,090
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	$ 173,298	$ 161,453
Total Capital to Risk Weighted Assets, Ratio	11.70%	11.90%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 148,745	$ 135,262
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	$ 164,915	$ 152,939
Tier 1 Capital to Risk Weighted Assets, Ratio	11.10%	11.30%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 118,996	$ 108,209
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	$ 164,915	$ 152,939
Common Equity Tier 1 capital to risk weighted assets	11.10%	11.30%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 96,684	$ 87,920
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	$ 164,915	$ 152,939
Tier 1 leverage Ratio	10.00%	10.00%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 82,848	$ 76,247
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	$ 320,347	$ 258,301
Total Capital to Risk Weighted Assets, Ratio	12.10%	11.10%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 263,235	$ 231,871
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	$ 313,195	$ 252,189
Tier 1 Capital to Risk Weighted Assets, Ratio	11.90%	10.90%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 210,588	$ 185,497
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	$ 313,195	$ 252,189
Common Equity Tier 1 capital to risk weighted assets	11.90%	10.90%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 171,102	$ 150,716
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	$ 313,195	$ 252,189
Tier 1 leverage Ratio	12.90%	12.90%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 115,309	$ 97,759
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	$ 124,373	$ 107,041
Total Capital to Risk Weighted Assets, Ratio	12.10%	11.60%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 102,488	$ 92,542
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	$ 119,374	$ 102,404
Tier 1 Capital to Risk Weighted Assets, Ratio	11.70%	11.10%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 81,991	$ 74,033
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	$ 119,374	$ 102,404
Common Equity Tier 1 capital to risk weighted assets	11.70%	11.10%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 66,617	$ 60,152
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	$ 119,374	$ 102,404
Tier 1 leverage Ratio	9.90%	9.90%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 58,613	$ 51,974
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	$ 273,571	$ 236,201
Total Capital to Risk Weighted Assets, Ratio	12.50%	11.10%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 213,524	$ 213,524
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	$ 260,577	$ 223,849
Tier 1 Capital to Risk Weighted Assets, Ratio	11.90%	10.50%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 170,819	$ 170,819
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	$ 260,577	$ 223,849
Common Equity Tier 1 capital to risk weighted assets	11.90%	10.50%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 138,791	$ 138,791
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	$ 260,577	$ 223,849
Tier 1 leverage Ratio	9.80%	9.80%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 132,394	$ 114,125
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	$ 123,145	$ 113,797
Total Capital to Risk Weighted Assets, Ratio	12.00%	11.40%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 102,250	$ 100,151
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	$ 118,260	$ 108,338
Tier 1 Capital to Risk Weighted Assets, Ratio	11.60%	10.80%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 81,800	$ 80,120
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	$ 118,260	$ 108,338
Common Equity Tier 1 capital to risk weighted assets	11.60%	10.80%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 66,463	$ 65,098
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	$ 118,260	$ 108,338
Tier 1 leverage Ratio	9.50%	9.50%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 60,266	$ 57,111
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	$ 171,084	$ 151,653
Total Capital to Risk Weighted Assets, Ratio	11.40%	11.20%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 149,803	$ 135,695
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	$ 161,666	$ 142,333
Tier 1 Capital to Risk Weighted Assets, Ratio	10.80%	10.50%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 119,842	$ 108,556
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	$ 161,666	$ 142,333
Common Equity Tier 1 capital to risk weighted assets	10.80%	10.50%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 97,372	$ 88,201
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	$ 161,666	$ 142,333
Tier 1 leverage Ratio	9.50%	9.50%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 89,945	$ 75,197
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	$ 170,716	$ 146,054
Total Capital to Risk Weighted Assets, Ratio	11.50%	11.80%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 148,838	$ 123,618
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	$ 164,827	$ 141,140
Tier 1 Capital to Risk Weighted Assets, Ratio	11.10%	11.40%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 119,071	$ 98,894
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	$ 164,827	$ 141,140
Common Equity Tier 1 capital to risk weighted assets	11.10%	11.40%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 96,745	$ 80,352
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	$ 164,827	$ 141,140
Tier 1 leverage Ratio	10.70%	10.70%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 79,777	$ 66,109
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	$ 226,252	$ 208,479
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	$ 197,639	$ 184,825
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	$ 217,958	$ 199,982
Tier 1 Capital to Risk Weighted Assets, Ratio	11.00%	10.80%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 158,111	$ 147,860
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	$ 217,958	$ 199,982
Common Equity Tier 1 capital to risk weighted assets	11.00%	10.80%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 128,465	$ 120,136
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	$ 217,958	$ 199,982
Tier 1 leverage Ratio	10.00%	10.00%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 116,750	$ 100,257
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	$ 187,518	$ 165,798
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	$ 165,019	$ 147,354
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	$ 181,195	$ 159,718
Tier 1 Capital to Risk Weighted Assets, Ratio	11.00%	10.80%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 132,015	$ 117,883
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	$ 181,195	$ 159,718
Common Equity Tier 1 capital to risk weighted assets	11.00%	10.80%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 107,262	$ 95,780
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	$ 181,195	$ 159,718
Tier 1 leverage Ratio	9.80%	9.80%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 98,039	$ 81,767
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	$ 127,003	$ 111,530
Total Capital to Risk Weighted Assets, Ratio	11.50%	11.10%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 110,369	$ 100,654
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	$ 119,740	$ 107,234
Tier 1 Capital to Risk Weighted Assets, Ratio	10.90%	10.70%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 88,295	$ 80,523
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	$ 119,740	$ 107,234
Common Equity Tier 1 capital to risk weighted assets	10.90%	10.70%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 71,740	$ 65,425
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	$ 119,740	$ 107,234
Tier 1 leverage Ratio	9.20%	9.20%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 63,078	$ 58,068
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	$ 161,899	$ 151,889
Total Capital to Risk Weighted Assets, Ratio	11.60%	11.40%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 139,529	$ 132,842
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	$ 155,975	$ 145,779
Tier 1 Capital to Risk Weighted Assets, Ratio	11.20%	11.00%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 111,623	$ 106,273
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	$ 155,975	$ 145,779
Common Equity Tier 1 capital to risk weighted assets	11.20%	11.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 90,694	$ 86,347
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	$ 155,975	$ 145,779
Tier 1 leverage Ratio	9.60%	9.60%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 80,708	$ 76,096
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	$ 156,023	$ 115,607
Total Capital to Risk Weighted Assets, Ratio	11.70%	11.40%
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 133,119	$ 101,337
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	$ 151,665	$ 111,454
Tier 1 Capital to Risk Weighted Assets, Ratio	11.40%	11.00%
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 106,495	$ 81,069
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	$ 151,665	$ 111,454
Common Equity Tier 1 capital to risk weighted assets	11.40%	11.00%
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 86,528	$ 65,869
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	$ 151,665	$ 111,454
Tier 1 leverage Ratio	9.80%	9.80%
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 74,348	$ 56,915
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	5.00%	5.00%