Securities (Amortized cost and fair value of debt securities by contractrual maturity) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Available-for-sale Securities
Securities available for sale, amortized cost	$ 656,902	$ 664,139
Available-for-sale securities, fair value	644,668
Held-to-maturity Securities
Securities held to maturity, amortized cost	218,794	269,783
Securities held to maturity, fair value	210,755
Debt Securities [Member]
Held-to-maturity Securities
Due in one year or less, amortized cost	0
Due after one year through five years, amortized cost	5,000
Due after five years through ten years, amortized cost	70,000
Due after ten years, amortized cost	82,067
Securities held to maturity, amortized cost	157,067
Due in one year or less, fair value	0
Due after one year through five years, fair value	5,055
Due after five years through ten years, fair value	65,105
Due after ten years, amortized cost	77,303
Securities held to maturity, fair value	147,463
Residential mortgage-backed securities [Member]
Held-to-maturity Securities
Securities held to maturity, amortized cost	18,024	23,827
Securities held to maturity, fair value	19,113
Agency CMOs [Member]
Held-to-maturity Securities
Securities held to maturity, amortized cost	43,703	49,051
Securities held to maturity, fair value	44,179
Debt Securities [Member]
Available-for-sale Securities
Due in one year or less, amortized cost	0
Due after one year through five years, amortized cost	0
Due after five years through ten years, amortized cost	47,480
Due after ten years, amortized cost	13,409
Securities available for sale, amortized cost	60,889
Due in one year or less, fair value	0
Due after one year through five years, fair value	0
Due after five years through ten years, fair value	44,074
Due after ten years, fair value	12,660
Available-for-sale securities, fair value	56,734
Residential mortgage-backed securities [Member]
Available-for-sale Securities
Securities available for sale, amortized cost	68,949	55,614
Available-for-sale securities, fair value	67,105
Agency CMOs [Member]
Available-for-sale Securities
Securities available for sale, amortized cost	527,064	547,641
Available-for-sale securities, fair value	$ 520,829

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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