Loss Sharing Agreements and FDIC Indemnification Assets: Schedule of Business Acquisitions, by Acquisition (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012 TeamBank Loans	Dec. 31, 2011 TeamBank Loans	Jun. 30, 2012 TeamBank Foreclosed Assets	Dec. 31, 2011 TeamBank Foreclosed Assets	Jun. 30, 2012 Vantus Bank Loans	Dec. 31, 2011 Vantus Bank Loans	Jun. 30, 2012 Vantus Bank Foreclosed Assets	Dec. 31, 2011 Vantus Bank Foreclosed Assets	Jun. 30, 2012 Sun Security Bank Loans	Dec. 31, 2011 Sun Security Bank Loans	Jun. 30, 2012 Sun Security Bank Foreclosed Assets	Dec. 31, 2011 Sun Security Bank Foreclosed Assets	Jun. 30, 2012 InterBank Loans	Apr. 27, 2012 InterBank Loans	Jun. 30, 2012 InterBank Foreclosed Assets	Apr. 27, 2012 InterBank Foreclosed Assets
Initial basis for loss sharing determination, net of activity since acquisition date	$ 109,907	$ 164,284	$ 17,168	$ 16,225	$ 124,844	$ 149,215	$ 4,422	$ 3,410	$ 158,464	$ 217,549	$ 13,877	$ 20,964	$ 384,986	$ 393,274	$ 6,628	$ 9,908
Non-credit premium (discount), net of activity since acquisition date	(588)	(1,363)			(240)	(503)			(3,221)	(2,658)			2,911	3,105
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)	(4,379)	(6,093)			(8,415)	(11,267)
Original estimated fair value of assets, net of activity since acquisition date	(91,407)	(128,875)	(11,094)	(10,342)	(107,485)	(123,036)	(3,253)	(2,069)	(110,478)	(144,626)	(9,152)	(8,338)	(276,976)	(285,458)	(4,770)	(6,216)
Expected loss remaining	13,533	27,953	6,074	5,883	8,704	14,409	1,169	1,341	44,765	70,265	4,725	12,626	110,921	110,921	1,858	3,692
Assumed loss sharing recovery percentage	81.00%	80.00%	80.00%	80.00%	80.00%	80.00%	80.00%	80.00%	77.00%	79.00%	80.00%	80.00%	81.00%	81.00%	80.00%	80.00%
Estimated loss sharing value	10,847	22,404	4,890	4,712	6,918	11,526	935	1,073	34,448	55,382	3,780	10,101	89,669	89,669	1,487	2,954
Indemnification assets to be amortized resulting from change in expected losses	3,857	5,726			6,732	9,014
Accretable discount on FDIC indemnification asset	(1,487)	(2,719)			(1,247)	(1,946)			(4,087)	(5,457)	(561)	(1,811)	(8,311)	(8,411)	(223)	(223)
Total FDIC indemnification asset	13,217	25,411	4,890	4,712	12,403	18,594	935	1,073	31,332	49,925	3,219	8,290	81,358	81,258	1,264	2,731
Indemnification asset to be amortized resulting from change in expected losses									$ 971	$ 55,382		$ 10,101

Initial basis for loss sharing determination, net of activity since acquisition date

$ 109,907

$ 164,284

$ 17,168

$ 16,225

$ 124,844

$ 149,215

$ 4,422

$ 3,410

$ 158,464

$ 217,549

$ 13,877

$ 20,964

$ 384,986

$ 393,274

$ 6,628

$ 9,908

Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)

(4,379)

(6,093)

(8,415)

(11,267)

Expected loss remaining

13,533

27,953

6,074

5,883

8,704

14,409

1,169

1,341

44,765

70,265

4,725

12,626

110,921

1,858

3,692

Estimated loss sharing value

10,847

22,404

4,890

4,712

6,918

11,526

935

1,073

34,448

55,382

3,780

10,101

89,669

1,487

2,954

Accretable discount on FDIC indemnification asset

(1,487)

(2,719)

(1,247)

(1,946)

(4,087)

(5,457)

(561)

(1,811)

(8,311)

(8,411)

(223)

Indemnification asset to be amortized resulting from change in expected losses

$ 971

$ 55,382

$ 10,101