Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other assets [Member]
Gross derivative positions	$ 7,769	$ 7,812
Offsetting derivative positions	4,217	5,642
Net amounts presented in balance sheet	3,552	2,170
Cash collateral pledged	0	0
Net amount	3,552	2,170
Other assets [Member] | Interest rate caps [Member]
Gross derivative positions	31	134
Offsetting derivative positions	0	0
Net amounts presented in balance sheet	31	134
Cash collateral pledged	0	0
Net amount	31	134
Other assets [Member] | Interest rate floors [Member]
Gross derivative positions	252
Offsetting derivative positions	0
Net amounts presented in balance sheet	252
Cash collateral pledged	0
Net amount	252
Other assets [Member] | Interest rate swaps with customers [Member]
Gross derivative positions	5,425	4,920
Offsetting derivative positions	2,156	2,884
Net amounts presented in balance sheet	3,269	2,036
Cash collateral pledged	0	0
Net amount	3,269	2,036
Other assets [Member] | Mirror swaps with counterparties [Member]
Gross derivative positions	2,061	2,758
Offsetting derivative positions	2,061	2,758
Net amounts presented in balance sheet	0	0
Cash collateral pledged	0	0
Net amount	0	0
Other liabilities [Member]
Gross derivative positions	8,091	8,248
Offsetting derivative positions	4,217	5,642
Net amounts presented in balance sheet	3,874	2,606
Cash collateral pledged	3,874	1,428
Net amount	0	1,178
Other liabilities [Member] | Interest rate swaps with customers [Member]
Gross derivative positions	2,156	2,884
Offsetting derivative positions	2,156	2,884
Net amounts presented in balance sheet	0	0
Cash collateral pledged	0	0
Net amount	0	0
Other liabilities [Member] | Mirror swaps with counterparties [Member]
Gross derivative positions	5,517	4,986
Offsetting derivative positions	2,061	2,758
Net amounts presented in balance sheet	3,456	2,228
Cash collateral pledged	3,456	1,295
Net amount	0	933
Other liabilities [Member] | Interest rate swaps [Member]
Gross derivative positions	418	378
Offsetting derivative positions	0	0
Net amounts presented in balance sheet	418	378
Cash collateral pledged	418	133
Net amount	$ 0	$ 245