Recent Accounting and Regulatory Pronouncements (Details)		3 Months Ended			9 Months Ended
	Jan. 01, 2020 USD ($)	Sep. 30, 2019 USD ($) loan	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2019 USD ($) loan	Sep. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Right to use asset		$ 89,905,000			$ 89,905,000
Lease liabilities		91,039,000			91,039,000
Allowance for credit losses		60,255,000	$ 53,837,000		60,255,000	$ 53,837,000	$ 58,213,000		$ 55,798,000	$ 52,300,000	$ 48,075,000
Increase in allowance for credit losses		(91,000)	$ (174,000)		$ (336,000)	$ (1,060,000)
Software
Capitalized implementation costs		$ 435,146
ASU 2018- 02 | Early adoption
Reclassified to retained earnings from AOCI				$ 2,900,000
ASU 2016- 02 | Adjustments
Right to use asset								$ 82,200,000
Lease liabilities								$ 82,200,000
Accounting Standards Update 2016-13 [Member]
Number of loan segments | loan		10			10
Historical losses term					10 years
Accounting Standards Update 2016-13 [Member] | Minimum | Forecast
Allowance for credit losses	$ 105,000,000
Increase in allowance for credit losses	35,000,000
Accounting Standards Update 2016-13 [Member] | Maximum | Forecast
Allowance for credit losses	120,000,000
Increase in allowance for credit losses	$ 50,000,000