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Non Purchased Loans - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) loan	Jun. 30, 2018 USD ($) loan	Jun. 30, 2019 USD ($) loan	Jun. 30, 2018 USD ($) loan	Dec. 31, 2018 USD ($)
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]
Allowance for loan losses attributable to restructured loans	$ 50,059,000		$ 50,059,000		$ 49,026,000
Non purchased loans and leases
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]
Mortgage and commercial loans discontinued past due period			90 days
Consumer and other retail loans charged-off past due period			120 days
Threshold for impairment measurement	$ 500,000		$ 500,000
Number of Loans | loan	5	1	5	5
Troubled debt restructured			$ 61,000	$ 0
Nonperforming loans charged-off past due period			90 days
Number of restructured loans | loan			1	2
Restructured loans discontinued past due period			90 days	90 days
Remaining availability under commitments to lend additional funds on restructured loans	$ 1,000	$ 22,000	$ 1,000	$ 22,000
Non purchased loans and leases | Nonaccruing Loans
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]
Outstanding balance of restructured loans	37,000	468,000	37,000	468,000
Non purchased loans and leases | Restructured Loans
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]
Outstanding balance of restructured loans	3,288,000	2,417,000	3,288,000	2,417,000
Allowance for loan losses attributable to restructured loans	$ 30,000	$ 37,000	$ 30,000	$ 37,000

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