Securities (Amortized cost and fair value of debt securities by contractrual maturity) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Available-for-sale Securities
Securities available for sale, amortized cost	$ 595,803	$ 607,680
Securities available for sale, fair value	604,940
Held-to-maturity Securities
Securities held to maturity, amortized cost	191,328	196,635
Securities held to maturity, fair value	195,209
Debt Securities [Member]
Held-to-maturity Securities
Securities held to maturity, amortized cost	127,087
Securities held to maturity, fair value	127,717
Residential mortgage-backed securities [Member]
Held-to-maturity Securities
Securities held to maturity, amortized cost	29,351	37,658
Securities held to maturity, fair value	31,652
Agency CMOs [Member]
Held-to-maturity Securities
Securities held to maturity, amortized cost	34,890	45,122
Securities held to maturity, fair value	35,840
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	31,010
Due after ten years, amortized cost	19,604
Securities available for sale, amortized cost	50,614
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	30,296
Due after ten years, fair value	19,544
Securities available for sale, fair value	49,840
Held-to-maturity Securities
Due in one year or less, amortized cost	10,000
Due after one year through five years, amortized cost	5,000
Due after five years through ten years, amortized cost	15,000
Due after ten years, amortized cost	97,087
Due in one year or less, fair value	9,950
Due after one year through five years, fair value	4,900
Due after five years through ten years, fair value	15,021
Due after ten years, amortized cost	97,846
Residential mortgage-backed securities [Member]
Available-for-sale Securities
Securities available for sale, amortized cost	70,356	21,087
Securities available for sale, fair value	71,600
Agency CMOs [Member]
Available-for-sale Securities
Securities available for sale, amortized cost	468,575	519,167
Securities available for sale, fair value	477,496
Private-label CMOs [Member]
Available-for-sale Securities
Securities available for sale, amortized cost	6,258	24,974
Securities available for sale, fair value	6,004
Held-to-maturity Securities
Securities held to maturity, amortized cost	0
Securities held to maturity, fair value	$ 0

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