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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 9,574,334	$ 9,346,474
Current	9,480,363	9,263,876
Past due	$ 93,969	$ 82,598
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.98%	0.88%	1.47%
Ratio of total past due loans to total loans receivable, current	99.02%	99.12%
Ratio of total past due loans to total loans receivable, past due	0.98%	0.88%
Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 25,793	$ 21,212
Ratio of total past due loans to total loans receivable, past due	0.27%	0.23%
Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 13,767	$ 9,198
Ratio of total past due loans to total loans receivable, past due	0.14%	0.10%
Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 54,412	$ 52,188
Ratio of total past due loans to total loans receivable, past due	0.57%	0.56%
Non-Acquired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 9,339,695	$ 9,073,176
Current	9,250,358	8,997,648
Past due	$ 89,335	$ 75,528
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.96%	0.83%
Non-Acquired loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 5,644,009	$ 5,655,928
Current	5,576,774	5,590,673
Past due	$ 67,234	$ 65,255
Ratio of past due loans to total loans, net of charge-offs and LIPs	1.19%	1.15%
Non-Acquired loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 325,485	$ 130,121
Current	324,619	130,121
Past due	$ 866	$ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.27%	0.00%
Non-Acquired loans | Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 221,327	$ 205,692
Current	218,773	204,168
Past due	$ 2,554	$ 1,524
Ratio of past due loans to total loans, net of charge-offs and LIPs	1.15%	0.74%
Non-Acquired loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 85,830	$ 75,661
Current	84,805	74,737
Past due	$ 1,025	$ 924
Ratio of past due loans to total loans, net of charge-offs and LIPs	1.19%	1.22%
Non-Acquired loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 102,887	$ 104,494
Current	100,224	102,045
Past due	$ 2,663	$ 2,449
Ratio of past due loans to total loans, net of charge-offs and LIPs	2.59%	2.34%
Non-Acquired loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 966,921	$ 1,068,038
Current	965,110	1,065,667
Past due	$ 1,811	$ 2,371
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.19%	0.22%
Non-Acquired loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 929,495	$ 893,072
Current	920,582	892,180
Past due	$ 8,913	$ 892
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.96%	0.10%
Non-Acquired loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 756,831	$ 617,545
Current	754,611	616,602
Past due	$ 2,220	$ 943
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.29%	0.15%
Non-Acquired loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 125,479	$ 127,648
Current	124,883	127,196
Past due	$ 595	$ 452
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.47%	0.35%
Non-Acquired loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	$ 181,431	$ 194,977
Current	179,977	194,259
Past due	$ 1,454	$ 718
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.80%	0.37%
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 24,245	$ 20,341
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	17,285	17,305
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	560	0
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	28	791
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	387	406
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	828	689
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,196	259
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	841	131
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	2,219	93
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	19	174
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	882	493
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	13,456	9,104
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	9,939	7,757
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	306	0
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	9	270
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	897	399
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	454
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,933	0
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1	27
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	19	27
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	352	170
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	51,637	46,083
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	40,010	40,193
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	0
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	2,518	463
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	638	518
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	938	1,361
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	615	1,658
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	6,139	761
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	823
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	558	251
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	221	55
Acquired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	140,995	57,682
Current	140,137	56,559
Past due	$ 858	$ 1,123
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.61%	1.95%
Acquired loans | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 193	$ 356
Acquired loans | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	16	0
Acquired loans | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	649	767
Credit impaired acquired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	55,060	139,726
Current	52,806	138,940
Past due	$ 2,254	$ 786
Ratio of past due loans to total loans, net of charge-offs and LIPs	4.09%	0.56%
Credit impaired acquired loans | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 854	$ 243
Credit impaired acquired loans | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	0	4
Credit impaired acquired loans | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,400	539
Covered loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans, net of charge-offs and LIP	38,584	75,890
Current	37,062	70,729
Past due	$ 1,522	$ 5,161
Ratio of past due loans to total loans, net of charge-offs and LIPs	3.94%	6.80%
Covered loans | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 501	$ 272
Covered loans | Financing Receivables, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	295	90
Covered loans | Financing Receivables, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	$ 726	$ 4,799

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