New Accounting Standards (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2018
New Accounting Standards [Abstract]
Non-interest income		$ 6,892		$ 19,994
Interchange Income [Member]
New Accounting Standards [Abstract]
Non-interest income		2,486		7,236
Interchange Expense [Member]
New Accounting Standards [Abstract]
Non-interest expense		715		1,974
ASU 2018-02 [Member]
New Accounting Standards [Abstract]
Reclassification of certain deferred tax effects			$ 40
Under Legacy GAAP [Member] | Interchange Income [Member]
New Accounting Standards [Abstract]
Non-interest income		2,088		6,170
Under Legacy GAAP [Member] | Interchange Expense [Member]
New Accounting Standards [Abstract]
Non-interest expense		317		908
Impact [Member]
New Accounting Standards [Abstract]
Impact on net income		0		0
Impact [Member] | ASU 2014-09 [Member] | Interchange Income [Member]
New Accounting Standards [Abstract]
Non-interest income	[1]	398		1,066
Impact [Member] | ASU 2014-09 [Member] | Interchange Expense [Member]
New Accounting Standards [Abstract]
Non-interest expense	[1]	$ 398		$ 1,066

[1] Represents certain costs charged by payment networks that were previously netted against interchange income.