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Securities - Available-for-Sales Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,413,238	$ 1,442,724
Gross Unrealized Gains	5,488	6,233
Gross Unrealized Losses	12,495	19,419
Fair Value	1,406,231	1,429,538
Obligations of U.S. Government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	532,958	527,057
Gross Unrealized Gains	2,466	2,873
Gross Unrealized Losses	1,222	2,303
Fair Value	534,202	527,627
Obligations of U.S. states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	91,771	89,910
Gross Unrealized Gains	558	286
Gross Unrealized Losses	286	1,140
Fair Value	92,043	89,056
U.S. Government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	145,470	159,417
Gross Unrealized Gains	903	1,081
Gross Unrealized Losses	1,700	2,272
Fair Value	144,673	158,226
U.S. Government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	639,454	662,724
Gross Unrealized Gains	1,561	1,993
Gross Unrealized Losses	8,869	13,287
Fair Value	632,146	651,430
Non-U.S. Government agencies or sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	85	116
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	85	116
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	1,412,238	1,441,724
Gross Unrealized Gains	5,488	6,233
Gross Unrealized Losses	12,415	19,340
Fair Value	1,405,311	1,428,617
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	80	79
Fair Value	$ 920	$ 921

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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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