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Acquisition - Carrying Value of Acquired Loans (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Business Acquisition [Line Items]    
Book value of loans acquired $ 1,394,375 $ 1,635,802
Accretion recorded on acquired loans year to date 3,908 966
West Suburban Bancorp, Inc    
Business Acquisition [Line Items]    
Book value of loans acquired 1,300,698 1,521,161
Abc Bank    
Business Acquisition [Line Items]    
Book value of loans acquired 49,643 68,783
Talmer Bank    
Business Acquisition [Line Items]    
Book value of loans acquired 44,034 45,858
PCD    
Business Acquisition [Line Items]    
Book value of loans acquired 82,349 106,956
Accretion recorded on acquired loans year to date 566 401
PCD | West Suburban Bancorp, Inc    
Business Acquisition [Line Items]    
Book value of loans acquired 80,224 102,409
PCD | Abc Bank    
Business Acquisition [Line Items]    
Book value of loans acquired 2,125 4,547
Non-PCD    
Business Acquisition [Line Items]    
Book value of loans acquired 1,312,026 1,528,846
Accretion recorded on acquired loans year to date 3,342 565
Non-PCD | West Suburban Bancorp, Inc    
Business Acquisition [Line Items]    
Book value of loans acquired 1,220,474 1,418,752
Non-PCD | Abc Bank    
Business Acquisition [Line Items]    
Book value of loans acquired 47,518 64,236
Non-PCD | Talmer Bank    
Business Acquisition [Line Items]    
Book value of loans acquired $ 44,034 $ 45,858