Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Allowance for Noncovered Loan and Lease Losses) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				$ 69,569				$ 72,454	$ 69,569	$ 72,454	$ 82,300
Charge-offs									(25,067)	(24,722)	(23,941)
Recoveries									15,079	15,110	14,196
Provision (recapture) for loan and lease losses	$ 2,349	$ 2,831	$ 2,202	1,209	$ 1,708	$ 980	$ 2,117	1,922	8,591	6,727	(101)
Balance at the end of year	68,172				69,569				68,172	69,569	72,454
Specific Reserve	653				241				653	241	1,690
General Allocation	67,519				69,328				67,519	69,328	70,764
Consumer [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				3,180				2,547	3,180	2,547	2,437
Charge-offs									(2,066)	(2,774)	(2,242)
Recoveries									931	1,353	552
Provision (recapture) for loan and lease losses									1,486	2,054	1,800
Balance at the end of year	3,531				3,180				3,531	3,180	2,547
Specific Reserve	15				0				15	0	4
General Allocation	3,516				3,180				3,516	3,180	2,543
Purchased Credit Impaired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				16,336				20,174	16,336	20,174	30,056
Charge-offs									(13,854)	(14,436)	(13,853)
Recoveries									7,329	7,721	7,232
Provision (recapture) for loan and lease losses									3,915	2,877	(3,261)
Balance at the end of year	13,726				16,336				13,726	16,336	20,174
Specific Reserve	0				0				0	0	0
General Allocation	13,726				16,336				13,726	16,336	20,174
Unallocated Financing Receivables [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				1,844				1,655	1,844	1,655	1,011
Charge-offs									0	0	0
Recoveries									0	0	0
Provision (recapture) for loan and lease losses									(1,275)	189	644
Balance at the end of year	569				1,844				569	1,844	1,655
Specific Reserve	0				0				0	0	0
General Allocation	569				1,844				569	1,844	1,655
Commercial business: Secured loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				25,923				31,027	25,923	31,027	27,270
Charge-offs									(7,486)	(4,159)	(4,148)
Recoveries									2,069	2,637	1,512
Provision (recapture) for loan and lease losses									11,815	(3,582)	6,393
Balance at the end of year	32,321				25,923				32,321	25,923	31,027
Specific Reserve	321				25				321	25	343
General Allocation	32,000				25,898				32,000	25,898	30,684
Commercial business: Unsecured loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				927				696	927	696	753
Charge-offs									(780)	(130)	(794)
Recoveries									267	370	932
Provision (recapture) for loan and lease losses									885	(9)	(195)
Balance at the end of year	1,299				927				1,299	927	696
Specific Reserve	0				2				0	2	35
General Allocation	1,299				925				1,299	925	661
Real estate: One-to-four family residential [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				2,281				1,252	2,281	1,252	694
Charge-offs									(376)	(230)	(228)
Recoveries									307	159	270
Provision (recapture) for loan and lease losses									(1,296)	1,100	516
Balance at the end of year	916				2,281				916	2,281	1,252
Specific Reserve	314				120				314	120	138
General Allocation	602				2,161				602	2,161	1,114
Real estate: Commercial and multifamily residential: Commercial land [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				799				489	799	489	460
Charge-offs									0	(29)	(20)
Recoveries									291	70	169
Provision (recapture) for loan and lease losses									88	269	(120)
Balance at the end of year	1,178				799				1,178	799	489
Specific Reserve	0				0				0	0	0
General Allocation	1,178				799				1,178	799	489
Real estate: Commercial and multifamiIy residential: Income property [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				9,159				9,234	9,159	9,234	11,033
Charge-offs									(390)	(1,934)	(1,405)
Recoveries									3,568	819	489
Provision (recapture) for loan and lease losses									(5,721)	1,040	(883)
Balance at the end of year	6,616				9,159				6,616	9,159	9,234
Specific Reserve	0				0				0	0	26
General Allocation	6,616				9,159				6,616	9,159	9,208
Real estate: Commercial and multifamiIy residential: Owner occupied [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				5,007				3,605	5,007	3,605	6,362
Charge-offs									(115)	(1,030)	(1,118)
Recoveries									116	51	375
Provision (recapture) for loan and lease losses									542	2,381	(2,014)
Balance at the end of year	5,550				5,007				5,550	5,007	3,605
Specific Reserve	0				27				0	27	1,073
General Allocation	5,550				4,980				5,550	4,980	2,532
Real estate construction: One-to-four family residential: Land and acquisition [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				1,197				610	1,197	610	1,171
Charge-offs									0	0	(32)
Recoveries									103	740	2,553
Provision (recapture) for loan and lease losses									(961)	(153)	(3,082)
Balance at the end of year	339				1,197				339	1,197	610
Specific Reserve	0				67				0	67	71
General Allocation	339				1,130				339	1,130	539
Real estate construction: One-to-four family residential: Residential construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				1,860				822	1,860	822	635
Charge-offs									0	0	(101)
Recoveries									90	1,190	112
Provision (recapture) for loan and lease losses									(1,217)	(152)	176
Balance at the end of year	733				1,860				733	1,860	822
Specific Reserve	3				0				3	0	0
General Allocation	730				1,860				730	1,860	822
Real estate construction: Commercial and multifamily residential: Income property [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				622				285	622	285	316
Charge-offs									0	0	0
Recoveries									8	0	0
Provision (recapture) for loan and lease losses									(242)	337	(31)
Balance at the end of year	388				622				388	622	285
Specific Reserve	0				0				0	0	0
General Allocation	388				622				388	622	285
Real estate construction: Commercial and multifamily residential: Owner occupied [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				$ 434				$ 58	434	58	102
Charge-offs									0	0	0
Recoveries									0	0	0
Provision (recapture) for loan and lease losses									572	376	(44)
Balance at the end of year	1,006				434				1,006	434	58
Specific Reserve	0				0				0	0	0
General Allocation	$ 1,006				$ 434				$ 1,006	$ 434	$ 58