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Investment Securities (Details - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Total securities available-for-sale $ 3,424,413 $ 3,213,655
Available-for-sale Securities, Gross Unrealized Gain 63,534 32,386
Available-for-sale Securities, Gross Unrealized Loss (13,387) (22,211)
Securities available‑for‑sale 3,474,560 3,223,830
Government agency and government-sponsored enterprise pass through securities    
Schedule of Available-for-sale Securities [Line Items]    
Total securities available-for-sale 402,654 499,185
Available-for-sale Securities, Gross Unrealized Gain 4,318 6,222
Available-for-sale Securities, Gross Unrealized Loss (2,652) (2,964)
Securities available‑for‑sale 404,320 502,443
Government agency and government-sponsored enterprise collateralized mortgage obligations    
Schedule of Available-for-sale Securities [Line Items]    
Total securities available-for-sale 132,494 145,258
Available-for-sale Securities, Gross Unrealized Gain 1,698 1,528
Available-for-sale Securities, Gross Unrealized Loss (400) (497)
Securities available‑for‑sale 133,792 146,289
Private label collateralized mortgage obligations    
Schedule of Available-for-sale Securities [Line Items]    
Total securities available-for-sale 157,187 122,707
Available-for-sale Securities, Gross Unrealized Gain 3,372 4,199
Available-for-sale Securities, Gross Unrealized Loss (858) (1,437)
Securities available‑for‑sale 159,701 125,469
Municipal securities    
Schedule of Available-for-sale Securities [Line Items]    
Total securities available-for-sale 1,492,834 1,447,064
Available-for-sale Securities, Gross Unrealized Gain 43,688 15,406
Available-for-sale Securities, Gross Unrealized Loss (1,968) (6,011)
Securities available‑for‑sale 1,534,554 1,456,459
Government agency and government-sponsored enterprise commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Total securities available-for-sale 919,696 555,552
Available-for-sale Securities, Gross Unrealized Gain 5,656 1,798
Available-for-sale Securities, Gross Unrealized Loss (7,142) (9,658)
Securities available‑for‑sale 918,210 547,692
Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Total securities available-for-sale 17,000 47,100
Available-for-sale Securities, Gross Unrealized Gain 2,185 680
Available-for-sale Securities, Gross Unrealized Loss 0 (271)
Securities available‑for‑sale 19,185 47,509
Collateralized loan obligations    
Schedule of Available-for-sale Securities [Line Items]    
Total securities available-for-sale 65,521 155,440
Available-for-sale Securities, Gross Unrealized Gain 820 1,685
Available-for-sale Securities, Gross Unrealized Loss (40) (238)
Securities available‑for‑sale 66,301 156,887
SBA asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Total securities available-for-sale 177,171 179,085
Available-for-sale Securities, Gross Unrealized Gain 1,112 510
Available-for-sale Securities, Gross Unrealized Loss (227) (750)
Securities available‑for‑sale 178,056 178,845
Asset-backed and other securities    
Schedule of Available-for-sale Securities [Line Items]    
Total securities available-for-sale 59,856 62,264
Available-for-sale Securities, Gross Unrealized Gain 685 358
Available-for-sale Securities, Gross Unrealized Loss (100) (385)
Securities available‑for‑sale $ 60,441 $ 62,237