CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income		$ 10,076	$ 8,646	[1],[2],[3],[4]
Net change in unrealized gains (losses) on available-for-sale securities:
Net change in unrealized (losses) gains on available-for-sale securities, net of tax of $247, and ($4,183), respectively		(458)	7,769
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Net change in unrealized gains (losses) on cash flow hedging derivatives, net of tax of ($48), and $1,261, respectively		90	(2,342)
Net reclassification adjustment for effective portion of cash flow hedges included in interest expense, net of tax of ($159) and ($128), respectively(1)	[5]	296	237
Net change in unrealized gains (losses) on cash flow hedging derivatives, net of tax		386	(2,105)
Reclassification of amortization of net unrecognized actuarial loss and prior service cost, net of tax of ($23) and ($21), respectively(2)	[6]	43	38
Other comprehensive (loss) income		(29)	5,702
Comprehensive Income		$ 10,047	$ 14,348

[1] (1) The financial information for the three months ended March 31, 2016 has been adjusted to reflect the adoption of ASU 2016-09.

[2] (1)The consolidated statement of cash flows for the three months ended March 31, 2016 has been adjusted to reflect the adoption of ASU 2016-09 in the second quarter of 2016 effective as of January 1, 2016.

[3] (1)The consolidated statement of income for the three months ended March 31, 2016 has been adjusted to reflect the adoption of Accounting Standards Updates No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09") in the second quarter of 2016 effective as of January 1, 2016.

[4] (5) Share and per share amounts for the three months ended March 31, 2016 have been adjusted to reflect the three-for-two stock split effective September 30, 2016.

[5] Reclassified into the consolidated statements of income in interest on subordinated debentures.

[6] (2) Reclassified into the consolidated statements of income in salaries and employee benefits.