Investment Securities: Schedule of Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011
One year or less
Available for Sale Securities Amortized Cost by Contractual Maturity	$ 1,120
Available for Sale Securities Fair Value by Contractual Maturity	1,120
After one through five years
Available for Sale Securities Amortized Cost by Contractual Maturity	975
Available for Sale Securities Fair Value by Contractual Maturity	993
After five through ten years
Available for Sale Securities Amortized Cost by Contractual Maturity	10,556
Available for Sale Securities Fair Value by Contractual Maturity	10,986
After ten years
Available for Sale Securities Amortized Cost by Contractual Maturity	190,566
Available for Sale Securities Fair Value by Contractual Maturity	198,737
Securities not due on a single maturity date
Available for Sale Securities Amortized Cost by Contractual Maturity	590,185
Available for Sale Securities Fair Value by Contractual Maturity	604,929
Equity Securities Contractual Maturity
Available for Sale Securities Amortized Cost by Contractual Maturity	1,230
Available for Sale Securities Fair Value by Contractual Maturity	2,426
Total Available For Sale Securities By Contractua lMaturity
Available for Sale Securities Amortized Cost by Contractual Maturity	794,632
Available for Sale Securities Fair Value by Contractual Maturity	$ 819,191