Interest-bearing Deposits and Securities: Schedule of Interest Bearing Deposits and Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011
Interest-bearing deposits included in cash and due from banks	$ 132,536		$ 69,758		$ 168,198
U.S. Government and agency obligations	229,669		341,606		216,761
Municipal bonds taxable	19,225		18,497		14,486
Municipal bonds tax exempt	102,139		88,963		83,315
Total municipal bonds	121,364		107,460		97,801
Corporate bonds	42,923		42,565		59,788
Mortgage-backed or related securities -- Ginnie Mae	16,736		19,572		21,818
Mortgage-backed or related securities -- Freddie Mac	62,782		42,001		25,941
Mortgage-backed or related securities -- Fannie Mae	88,610		66,519		27,362
Mortgage-backed or related securities -- Private issuer	1,780		1,835		3,108
Total mortgage-backed or related securities	169,908		129,927		78,229
Asset-backed securities -- Student Loan Marketing Association (SLMA)	32,492
Equity securities	454	[1]	402	[1]	646	[1]
Total securities	596,810		621,960		453,225
Federal Home Loan Bank (FHLB) stock	37,371		37,371		37,371
Total interest-bearing deposits and securities	$ 766,717		$ 729,089		$ 658,794

[1] Excludes FHLB stock