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Loan Servicing Rights - Components of Loan Servicing Rights and Valuation Allowance (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Servicing asset:          
Balance at beginning of period $ 38,121,000 $ 28,886,000 $ 30,085,000 $ 28,124,000  
Additions 1,280,000 2,671,000 12,293,000 8,842,000  
Amortization (1,569,000) (2,236,000) (4,546,000) (7,645,000)  
Balance before valuation allowance at end of period 37,832,000 29,321,000 37,832,000 29,321,000  
Valuation allowance:          
Balance at beginning of period 0 (105,000) (46,000) (1,407,000)  
(Additions)/recoveries 0 5,000 46,000 1,307,000  
Balance at end of period 0 (100,000) 0 (100,000)  
Loan servicing rights, net $ 37,832,000 $ 29,221,000 37,832,000 $ 29,221,000 $ 30,000,000
First Midwest          
Servicing asset:          
Additions     $ 7,700,000