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Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,442,724	$ 1,390,255
Gross Unrealized Gains	6,233	9,546
Gross Unrealized Losses	19,419	14,117
Fair Value	1,429,538	1,385,684
Obligations of U.S. Government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	527,057	551,176
Gross Unrealized Gains	2,873	3,512
Gross Unrealized Losses	2,303	1,795
Fair Value	527,627	552,893
Obligations of U.S. states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	89,910	83,981
Gross Unrealized Gains	286	898
Gross Unrealized Losses	1,140	153
Fair Value	89,056	84,726
U.S. Government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	159,417	94,459
Gross Unrealized Gains	1,081	1,535
Gross Unrealized Losses	2,272	1,316
Fair Value	158,226	94,678
U.S. Government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	662,724	656,947
Gross Unrealized Gains	1,993	3,599
Gross Unrealized Losses	13,287	10,449
Fair Value	651,430	650,097
Non-U.S. Government agencies or sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	116	192
Gross Unrealized Gains	0	2
Gross Unrealized Losses	0	0
Fair Value	116	194
U.S. corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,500	2,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	338	338
Fair Value	2,162	2,162
Total debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,441,724	1,389,255
Gross Unrealized Gains	6,233	9,546
Gross Unrealized Losses	19,340	14,051
Fair Value	1,428,617	1,384,750
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	79	66
Fair Value	$ 921	$ 934

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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