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Securities Available-for-Sale - Composition of Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 681,758	$ 686,205
Gross Unrealized Gains	10,014	10,754
Gross Unrealized Losses	(2,384)	(3,472)
Fair Value	689,388	693,487
U.S. treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,917	24,891
Gross Unrealized Gains	2	47
Gross Unrealized Losses	(33)	(127)
Fair Value	24,886	24,811
Obligations of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	210,459	230,989
Gross Unrealized Gains	1,328	1,573
Gross Unrealized Losses	(353)	(383)
Fair Value	211,434	232,179
Collateralized mortgage obligations of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	120,272	130,046
Gross Unrealized Gains	527	465
Gross Unrealized Losses	(596)	(734)
Fair Value	120,203	129,777
Residential mortgage-backed securities of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,850	36,606
Gross Unrealized Gains	948	984
Gross Unrealized Losses	(187)	(232)
Fair Value	34,611	37,358
Commercial mortgage-backed securities of U.S. government corporations and agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	162,981	127,311
Gross Unrealized Gains	646	243
Gross Unrealized Losses	(1,214)	(1,950)
Fair Value	162,413	125,604
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	125,464	128,783
Gross Unrealized Gains	5,642	3,772
Gross Unrealized Losses	0	(46)
Fair Value	131,106	132,509
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	677,943	678,626
Gross Unrealized Gains	9,093	7,084
Gross Unrealized Losses	(2,383)	(3,472)
Fair Value	684,653	682,238
Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,815	7,579
Gross Unrealized Gains	921	3,670
Gross Unrealized Losses	(1)	0
Fair Value	$ 4,735	$ 11,249

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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