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Acquisition (Tables)
 9 Months Ended
Sep. 30, 2020
Business Combinations [Abstract]  
Schedule of preliminary valuations of the fair value of assets acquired and liabilities assumed Based on valuations of the fair value of tangible and intangible assets acquired and liabilities assumed, which are based on assumptions that are subject to change based on the timing of the transaction, the purchase price for the MBT acquisition is detailed in the following table.
Fair Value
Cash and cash equivalents$10,222 
Interest-bearing time deposits281,228 
Investment securities212,235 
Loans732,578 
Premises and equipment21,664 
Federal Home Loan Bank stock4,148 
Interest receivable3,361 
Cash surrender value of life insurance59,545 
Tax asset, deferred and receivable5,205 
Other assets6,011 
Deposits(1,105,926)
Securities sold under repurchase agreements(94,760)
Federal Home Loan Bank advances(10,853)
Other liabilities(9,807)
Net tangible assets acquired114,851 
Core deposit intangible16,527 
Goodwill98,563 
Purchase price$229,941 
Schedule of acquired loan data
Acquired loan data for MBT is included in the following table:
Fair Value of Acquired Loans at Acquisition DateGross Contractual Amounts Receivable at Acquisition DateBest Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected
Acquired receivables subject to ASC 310-30$3,531 $6,840 $2,733 
Acquired receivables not subject to ASC 310-30$729,047 $907,210 $14,722 
The following table presents loans acquired, as of the acquisition date, during the nine months ended September 30, 2019, for which it was probable that all contractually required payments would not be collected. There were no loans acquired during the nine months ended September 30, 2020.
MBT
Contractually required payments receivable at acquisition date$6,840 
Nonaccretable difference2,733 
Expected cash flows at acquisition date4,107 
Accretable difference576 
Basis in loans at acquisition date$3,531 
Schedule of pro forma financial information
The results of operations of MBT have been included in the Corporation's consolidated financial statements since the acquisition date. The following table includes pro forma results for the year ended December 31, 2019 as if the MBT acquisition occurred as of the beginning of the period presented.
2019
Total revenue (net interest income plus other income)$474,891 
Net income available to common shareholders$161,228 
Earnings per share:
Basic$2.89 
Diluted$2.88