Commitments and Credit Risk (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Other Commitments [Line Items]
Outstanding letters of credit	$ 71,074,000	$ 39,101,000
Standby Letters of Credit
Other Commitments [Line Items]
Deferred revenue	$ 0	$ 0
Minimum
Other Commitments [Line Items]
Term of letter of credit	9 months	9 months
Maximum
Other Commitments [Line Items]
Term of letter of credit	15 years	15 years
Credit Card Commitments
Other Commitments [Line Items]
Outstanding commitments to extend credit	$ 634,788,000	$ 560,863,000
Other Loan Commitments
Other Commitments [Line Items]
Outstanding commitments to extend credit	$ 3,991,931,000	$ 3,455,471,000