Interest-bearing Deposits and Securities: Schedule of Amortized Cost and Fair Value of Pledged Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
State and local governments public deposits
Pledged Securities Amortized Cost	$ 99,188
Pledged Securities Fair Value	105,703
Interest rate swap counterparties
Pledged Securities Amortized Cost	10,153
Pledged Securities Fair Value	10,275
Retail repurchase transaction accounts
Pledged Securities Amortized Cost	105,347
Pledged Securities Fair Value	108,261
Other types
Pledged Securities Amortized Cost	6,142
Pledged Securities Fair Value	6,310
Total pledged securities
Pledged Securities Amortized Cost	220,830
Pledged Securities Fair Value	$ 230,549