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Nature of Operations and Summary of Significant Accounting Policies (Details Textual)
6 Months Ended
Jun. 30, 2020
USD ($)
operating_segment
numberOfComponents
quarter
division
Jun. 30, 2019
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of Bank Divisions | division 16          
Number of Operating Segments | operating_segment 1          
Forecasting period used to determine ACL | quarter 4          
Number of components used in methodology in determining ACL | numberOfComponents 2          
Period of Finance Receivable Modifications Due to COVID-19 6 months          
Maximum Term Leases Will Be Considered Short-term 12 months          
Revenue from Contracts with Customers $ 26,239,000 $ 38,943,000        
Impairment losses on receivables related to contracts with customers 0     $ 0    
Cumulative Effect of New Accounting Principle in Period of Adoption (12,347,000) (25,458,000)        
Allowance for credit losses on loans 162,509,000 129,054,000 $ 150,190,000 124,490,000 $ 129,786,000 $ 131,239,000
Deferred tax asset 0     $ 2,037,000    
Retained Earnings Substantially Restricted            
Cumulative Effect of New Accounting Principle in Period of Adoption (12,347,000) $ (25,458,000)        
Accounting Standards Update 2016-13            
Allowance for credit losses on loans 3,720,000          
ACL on off-balance sheet credit exposures 12,817,000          
Deferred tax asset 4,190,000          
Accounting Standards Update 2016-13 | Retained Earnings Substantially Restricted            
Cumulative Effect of New Accounting Principle in Period of Adoption $ (12,347,000)          
Minimum Range            
Period Past Due to Consider Loan as Delinquent 30 days          
Period Past Due to Consider Loan as Non Accrual 90 days          
Period Past Due to Consider Loan as Purchased Credit-deteriorated Loan 90 days          
Number of Days Delinquent to Charge off Loans 120 days          
Number of years for home equity loan origination term 10 years          
Maximum Range            
Period Past Due to Consider Loan as Delinquent 89 days          
Number of years for home equity loan origination term 15 years