Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other assets [Member]
Gross derivative positions	$ 12,803	$ 7,006
Offsetting derivative positions	389	5,238
Net amounts presented in balance sheet	12,414	1,768
Cash collateral pledged	0	0
Net amount	12,414	1,768
Other assets [Member] | Interest rate floors [Member]
Gross derivative positions	90	110
Offsetting derivative positions	0	0
Net amounts presented in balance sheet	90	110
Cash collateral pledged	0	0
Net amount	90	110
Other assets [Member] | Interest rate caps [Member]
Gross derivative positions	67	25
Offsetting derivative positions	0	0
Net amounts presented in balance sheet	67	25
Cash collateral pledged	0	0
Net amount	67	25
Other assets [Member] | Interest rate swaps [Member]
Gross derivative positions	1,313	213
Offsetting derivative positions	0	0
Net amounts presented in balance sheet	1,313	213
Cash collateral pledged	0	0
Net amount	1,313	213
Other assets [Member] | Interest rate swaps with customers [Member]
Gross derivative positions	161	2,857
Offsetting derivative positions	24	2,589
Net amounts presented in balance sheet	137	268
Cash collateral pledged	0	0
Net amount	137	268
Other assets [Member] | Mirror swaps with counterparties [Member]
Gross derivative positions	11,152	3,801
Offsetting derivative positions	365	2,649
Net amounts presented in balance sheet	10,787	1,152
Cash collateral pledged	0	0
Net amount	10,787	1,152
Other assets [Member] | Foreign exchange contracts [Member]
Gross derivative positions	20
Offsetting derivative positions	0
Net amounts presented in balance sheet	20
Cash collateral pledged	0
Net amount	20
Other liabilities [Member]
Gross derivative positions	11,504	6,841
Offsetting derivative positions	389	5,238
Net amounts presented in balance sheet	11,115	1,603
Cash collateral pledged	0	1,039
Net amount	11,115	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	11,343	3,884
Offsetting derivative positions	365	2,589
Net amounts presented in balance sheet	10,978	1,295
Cash collateral pledged	0	1,025
Net amount	10,978	270
Other liabilities [Member] | Mirror swaps with counterparties [Member]
Gross derivative positions	161	2,917
Offsetting derivative positions	24	2,649
Net amounts presented in balance sheet	137	268
Cash collateral pledged	0	0
Net amount	$ 137	268
Other liabilities [Member] | Foreign exchange contracts [Member]
Gross derivative positions		26
Offsetting derivative positions		0
Net amounts presented in balance sheet		26
Cash collateral pledged		0
Net amount		$ 26