Borrowed Funds - Short-Term Borrowings and Repurchase Agreements (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Borrowed funds
Federal Home Loan Bank and Other Borrowings	$ 213,008	$ 183,198
Short-term borrowings from FHLB
Short-term borrowings and Repurchase Agreements
Balance at end of year	209,773	179,917
Average balance during the year	177,368	121,425
Maximum month-end balance	$ 209,773	$ 179,917
Weighted-average rate during the year	0.47%	0.34%
Rate at the end of the period	0.48%	0.44%
Repurchase agreements
Short-term borrowings and Repurchase Agreements
Balance at end of year	$ 26,048	$ 27,437
Average balance during the year	28,816	26,884
Maximum month-end balance	$ 29,561	$ 32,470
Weighted-average rate during the year	0.26%	0.31%
Rate at the end of the period	0.24%	0.30%
Investment Securities And FHLB Letters Of Credit [Member]
Borrowed funds
Federal Home Loan Bank and Other Borrowings	$ 26,900	$ 28,300