Regulatory Matters (Schedule of Actual Capital Amounts and Ratios) (Details) $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Ratio	0.126	0.122
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100
Tier 1 Capital to Risk Weighted Assets, Ratio	0.100	0.096
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080
Common Equity Tier 1 capital to risk weighted assets	0.088	0.092
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065
Tier 1 Leverage Ratio	0.081	0.087
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050
Lake Forest Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 525,202	$ 461,643
Total Capital to Risk Weighted Assets, Ratio	0.120	0.120
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 436,884	$ 386,358
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 494,957	$ 440,585
Tier 1 Capital to Risk Weighted Assets, Ratio	0.113	0.114
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 349,507	$ 309,087
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 494,957	$ 440,585
Common Equity Tier 1 capital to risk weighted assets	0.113	0.114
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 283,975	$ 251,133
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 494,957	$ 440,585
Tier 1 Leverage Ratio	0.088	0.099
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 281,365	$ 223,497
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
Hinsdale Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 347,559	$ 339,158
Total Capital to Risk Weighted Assets, Ratio	0.127	0.126
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 274,208	$ 268,915
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 323,207	$ 328,046
Tier 1 Capital to Risk Weighted Assets, Ratio	0.118	0.122
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 219,366	$ 215,132
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 323,207	$ 328,046
Common Equity Tier 1 capital to risk weighted assets	0.118	0.122
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 178,235	$ 174,795
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 323,207	$ 328,046
Tier 1 Leverage Ratio	0.085	0.111
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 190,608	$ 147,512
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
Wintrust Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 808,451	$ 709,328
Total Capital to Risk Weighted Assets, Ratio	0.116	0.118
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 697,039	$ 602,969
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 728,787	$ 668,922
Tier 1 Capital to Risk Weighted Assets, Ratio	0.105	0.111
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 557,631	$ 482,375
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 728,787	$ 668,922
Common Equity Tier 1 capital to risk weighted assets	0.105	0.111
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 453,075	$ 391,930
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 728,787	$ 668,922
Tier 1 Leverage Ratio	0.088	0.103
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 412,878	$ 324,017
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
Libertyville Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 184,387	$ 173,298
Total Capital to Risk Weighted Assets, Ratio	0.114	0.117
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 161,448	$ 148,745
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 169,328	$ 164,915
Tier 1 Capital to Risk Weighted Assets, Ratio	0.105	0.111
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 129,158	$ 118,996
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 169,328	$ 164,915
Common Equity Tier 1 capital to risk weighted assets	0.105	0.111
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 104,941	$ 96,684
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 169,328	$ 164,915
Tier 1 Leverage Ratio	0.085	0.100
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 99,846	$ 82,848
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
Barrington Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 372,944	$ 320,347
Total Capital to Risk Weighted Assets, Ratio	0.118	0.121
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 316,946	$ 263,235
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 362,326	$ 313,195
Tier 1 Capital to Risk Weighted Assets, Ratio	0.114	0.119
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 253,556	$ 210,588
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 362,326	$ 313,195
Common Equity Tier 1 capital to risk weighted assets	0.114	0.119
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 206,015	$ 171,102
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 362,326	$ 313,195
Tier 1 Leverage Ratio	0.115	0.136
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 158,153	$ 115,309
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
Crystal Lake Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 127,621	$ 124,373
Total Capital to Risk Weighted Assets, Ratio	0.114	0.121
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 111,594	$ 102,488
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 118,085	$ 119,374
Tier 1 Capital to Risk Weighted Assets, Ratio	0.106	0.117
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 89,275	$ 81,991
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 118,085	$ 119,374
Common Equity Tier 1 capital to risk weighted assets	0.106	0.117
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 72,536	$ 66,617
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 118,085	$ 119,374
Tier 1 Leverage Ratio	0.090	0.102
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 65,329	$ 58,613
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
Northbrook Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 300,427	$ 273,571
Total Capital to Risk Weighted Assets, Ratio	0.117	0.125
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 257,849	$ 213,524
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 280,852	$ 260,577
Tier 1 Capital to Risk Weighted Assets, Ratio	0.109	0.119
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 206,279	$ 170,819
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 280,852	$ 260,577
Common Equity Tier 1 capital to risk weighted assets	0.109	0.119
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 167,602	$ 138,791
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 280,852	$ 260,577
Tier 1 Leverage Ratio	0.085	0.098
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 164,599	$ 132,394
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
Schaumburg Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 128,475	$ 123,145
Total Capital to Risk Weighted Assets, Ratio	0.113	0.120
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 113,610	$ 102,250
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 119,335	$ 118,260
Tier 1 Capital to Risk Weighted Assets, Ratio	0.105	0.116
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 90,888	$ 81,800
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 119,335	$ 118,260
Common Equity Tier 1 capital to risk weighted assets	0.105	0.116
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 73,846	$ 66,463
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 119,335	$ 118,260
Tier 1 Leverage Ratio	0.084	0.098
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 70,740	$ 60,266
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
Village Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 192,387	$ 171,084
Total Capital to Risk Weighted Assets, Ratio	0.119	0.114
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 161,866	$ 149,803
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 176,868	$ 161,666
Tier 1 Capital to Risk Weighted Assets, Ratio	0.109	0.108
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 129,493	$ 119,842
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 176,868	$ 161,666
Common Equity Tier 1 capital to risk weighted assets	0.109	0.108
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 105,213	$ 97,372
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 176,868	$ 161,666
Tier 1 Leverage Ratio	0.083	0.090
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 106,021	$ 89,945
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
Beverly Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 184,270	$ 170,716
Total Capital to Risk Weighted Assets, Ratio	0.121	0.115
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 152,521	$ 148,838
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 173,168	$ 164,827
Tier 1 Capital to Risk Weighted Assets, Ratio	0.114	0.111
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 122,017	$ 119,071
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 173,168	$ 164,827
Common Equity Tier 1 capital to risk weighted assets	0.114	0.111
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 99,139	$ 96,745
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 173,168	$ 164,827
Tier 1 Leverage Ratio	0.101	0.103
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 86,022	$ 79,777
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
Town Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 252,271	$ 226,252
Total Capital to Risk Weighted Assets, Ratio	0.118	0.115
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 213,661	$ 197,639
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 236,926	$ 217,958
Tier 1 Capital to Risk Weighted Assets, Ratio	0.111	0.110
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 170,929	$ 158,111
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 236,926	$ 217,958
Common Equity Tier 1 capital to risk weighted assets	0.111	0.110
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 138,880	$ 128,465
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 236,926	$ 217,958
Tier 1 Leverage Ratio	0.081	0.093
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 145,977	$ 116,750
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
Wheaton Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 213,784	$ 187,518
Total Capital to Risk Weighted Assets, Ratio	0.114	0.114
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 186,919	$ 165,019
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 199,134	$ 181,195
Tier 1 Capital to Risk Weighted Assets, Ratio	0.107	0.110
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 149,535	$ 132,015
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 199,134	$ 181,195
Common Equity Tier 1 capital to risk weighted assets	0.107	0.110
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 121,497	$ 107,262
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 199,134	$ 181,195
Tier 1 Leverage Ratio	0.077	0.092
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 128,592	$ 98,039
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
State Bank of the Lakes
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 131,068	$ 127,003
Total Capital to Risk Weighted Assets, Ratio	0.116	0.115
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 113,363	$ 110,369
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 122,183	$ 119,740
Tier 1 Capital to Risk Weighted Assets, Ratio	0.108	0.109
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 90,690	$ 88,295
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 122,183	$ 119,740
Common Equity Tier 1 capital to risk weighted assets	0.108	0.109
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 73,686	$ 71,740
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 122,183	$ 119,740
Tier 1 Leverage Ratio	0.082	0.095
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 74,986	$ 63,078
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
Old Plank Trail Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 177,047	$ 161,899
Total Capital to Risk Weighted Assets, Ratio	0.120	0.116
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 147,607	$ 139,529
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 155,975	$ 155,975
Tier 1 Capital to Risk Weighted Assets, Ratio	0.109	0.112
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 118,085	$ 111,623
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 155,975	$ 155,975
Common Equity Tier 1 capital to risk weighted assets	0.109	0.112
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 95,944	$ 90,694
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 155,975	$ 155,975
Tier 1 Leverage Ratio	0.082	0.097
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 98,610	$ 80,708
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050
St. Charles Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Amount	$ 165,876	$ 156,023
Total Capital to Risk Weighted Assets, Ratio	0.120	0.117
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 138,774	$ 133,119
Total Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.100	0.100
Tier 1 Capital to Risk Weighted Assets, Amount	$ 153,704	$ 151,665
Tier 1 Capital to Risk Weighted Assets, Ratio	0.111	0.114
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 111,019	$ 106,495
Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.080	0.080
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount	$ 153,704	$ 151,665
Common Equity Tier 1 capital to risk weighted assets	0.111	0.114
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Amount	$ 90,203	$ 86,528
Common Equity Tier 1 Capital to Risk Weighted Assets, To Be Well Capitalized by Regulatory Definition, Ratio	0.065	0.065
Tier 1 Leverage Ratio, Amount	$ 153,704	$ 151,665
Tier 1 Leverage Ratio	0.088	0.101
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Amount	$ 87,849	$ 74,348
Tier 1 Leverage Ratio, To Be Well Capitalized by Regulatory Definition, Ratio	0.050	0.050