Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Other assets [Member]
Gross derivative positions	$ 16,774	$ 7,006
Offsetting derivative positions	782	5,238
Net amounts presented in balance sheet	15,992	1,768
Cash collateral pledged	0	0
Net amount	15,992	1,768
Other assets [Member] | Interest rate floors [Member]
Gross derivative positions	125	110
Offsetting derivative positions	0	0
Net amounts presented in balance sheet	125	110
Cash collateral pledged	0	0
Net amount	125	110
Other assets [Member] | Interest rate caps [Member]
Gross derivative positions	71	25
Offsetting derivative positions	0	0
Net amounts presented in balance sheet	71	25
Cash collateral pledged	0	0
Net amount	71	25
Other assets [Member] | Interest rate swaps [Member]
Gross derivative positions	1,699	213
Offsetting derivative positions	0	0
Net amounts presented in balance sheet	1,699	213
Cash collateral pledged	0	0
Net amount	1,699	213
Other assets [Member] | Interest rate swaps with customers [Member]
Gross derivative positions	109	2,857
Offsetting derivative positions	49	2,589
Net amounts presented in balance sheet	60	268
Cash collateral pledged	0	0
Net amount	60	268
Other assets [Member] | Mirror swaps with counterparties [Member]
Gross derivative positions	14,770	3,801
Offsetting derivative positions	733	2,649
Net amounts presented in balance sheet	14,037	1,152
Cash collateral pledged	0	0
Net amount	14,037	1,152
Other liabilities [Member]
Gross derivative positions	15,092	6,841
Offsetting derivative positions	782	5,238
Net amounts presented in balance sheet	14,310	1,603
Cash collateral pledged	0	1,039
Net amount	14,310	564
Other liabilities [Member] | Interest rate swaps [Member]
Gross derivative positions		14
Offsetting derivative positions		0
Net amounts presented in balance sheet		14
Cash collateral pledged		14
Net amount		0
Other liabilities [Member] | Interest rate swaps with customers [Member]
Gross derivative positions	14,962	3,884
Offsetting derivative positions	733	2,589
Net amounts presented in balance sheet	14,229	1,295
Cash collateral pledged	0	1,025
Net amount	14,229	270
Other liabilities [Member] | Mirror swaps with counterparties [Member]
Gross derivative positions	109	2,917
Offsetting derivative positions	49	2,649
Net amounts presented in balance sheet	60	268
Cash collateral pledged	0	0
Net amount	60	268
Other liabilities [Member] | Foreign exchange contracts [Member]
Gross derivative positions	21	26
Offsetting derivative positions	0	0
Net amounts presented in balance sheet	21	26
Cash collateral pledged	0	0
Net amount	$ 21	$ 26