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Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,433,013	$ 1,442,724
Gross Unrealized Gains	6,137	6,233
Gross Unrealized Losses	14,279	19,419
Fair Value	1,424,871	1,429,538
Obligations of U.S. Government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	526,734	527,057
Gross Unrealized Gains	2,906	2,873
Gross Unrealized Losses	1,260	2,303
Fair Value	528,380	527,627
Obligations of U.S. states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	92,151	89,910
Gross Unrealized Gains	593	286
Gross Unrealized Losses	299	1,140
Fair Value	92,445	89,056
U.S. Government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	149,281	159,417
Gross Unrealized Gains	1,025	1,081
Gross Unrealized Losses	1,824	2,272
Fair Value	148,482	158,226
U.S. Government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	661,251	662,724
Gross Unrealized Gains	1,613	1,993
Gross Unrealized Losses	10,477	13,287
Fair Value	652,387	651,430
Non-U.S. Government agencies or sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	96	116
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	96	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	1,432,013	1,441,724
Gross Unrealized Gains	6,137	6,233
Gross Unrealized Losses	14,198	19,340
Fair Value	1,423,952	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	81	79
Fair Value	$ 919	$ 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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