CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income	$ 10,379	$ 4,398
Unrealized gains and losses on securities available-for-sale:
Unrealized holding gains on available-for-sale securities	1,509	3,516
Tax effect	(595)	(1,190)
Net of tax amount	914	2,326
Reclassification adjustment for realized gains arising during period	(506)	(1,415)
Tax effect	207	380
Net of tax amount	(299)	(1,035)
Amortization of unrealized losses holding gains on held-to-maturity securities transferred from available-for-sale securities	65	45
Tax effect	(25)	(20)
Net of tax amount	40	25
Unrealized losses on cash flow hedge	(534)
Tax effect	218
Net of tax amount	(316)
Unrealized pension plan gains	742	1,281
Tax effect	(303)	(523)
Net of tax amount	439	758
Total other comprehensive income	778	2,074
Total comprehensive income	$ 11,157	$ 6,472